Add S/PDIF to GUI design tool

gui/list.html

 </script>
 
 
-<script type="text/javascript">
-	RED.nodes.registerType('AudioInputI2Sslave',{
-	shortName: "i2ss",
-		inputs:0,
-		outputs:2,
-		category: 'input-function',
-		color:"#E6E0F8",
-		icon: "arrow-in.png"
-	});
-</script>
-<script type="text/x-red" data-help-name="AudioInputI2Sslave">
-	<h3>Summary</h3>
-	<p>Receive 16 bit stereo audio from an I2S device using I2S slave mode.</p>
-	<h3>Audio Connections</h3>
-	<table class=doc align=center cellpadding=3>
-		<tr class=top><th>Port</th><th>Purpose</th></tr>
-		<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
-		<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
-	</table>
-	<h3>Functions</h3>
-	<p>This object has no functions to call from the Arduino sketch.  It
-		simply streams data from the I2S hardware to its 2 output ports.</p>
-	<h3>Hardware</h3>
-	<p>The I2S signals are used in "slave" mode, where the I2S device controls
-		data timing.</p>
-	<table class=doc align=center cellpadding=3>
-		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>
-		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>
-		<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr>
-		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>
-	</table>
-	<!--<h3>Examples</h3>
-	<p class=exam>File &gt; Examples &gt; Audio &gt; 
-	</p>-->
-	<h3>Notes</h3>
-	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and
-		PWM</b> signals.  Differences in timing between the I2S device and
-		Teensy's clock can cause occasional audio glitches when I2S slave mode
-		is used together with other input or output objects based on Teensy's
-		timing.</p>
-	<p>Only one I2S input and one I2S output object may be used.  Master
-		and slave modes may not be mixed (both must be of the same type).
-	</p>
-</script>
-<script type="text/x-red" data-template-name="AudioInputI2Sslave">
-	<div class="form-row">
-		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
-		<input type="text" id="node-input-name" placeholder="Name">
-	</div>
-</script>
-
-
-
 <script type="text/javascript">
 	RED.nodes.registerType('AudioInputAnalog',{
 	shortName: "adc",
 </script>
 
 
+<script type="text/javascript">
+	RED.nodes.registerType('AudioInputI2Sslave',{
+	shortName: "i2ss",
+		inputs:0,
+		outputs:2,
+		category: 'input-function',
+		color:"#E6E0F8",
+		icon: "arrow-in.png"
+	});
+</script>
+<script type="text/x-red" data-help-name="AudioInputI2Sslave">
+	<h3>Summary</h3>
+	<p>Receive 16 bit stereo audio from an I2S device using I2S slave mode.</p>
+	<h3>Audio Connections</h3>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Port</th><th>Purpose</th></tr>
+		<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
+		<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
+	</table>
+	<h3>Functions</h3>
+	<p>This object has no functions to call from the Arduino sketch.  It
+		simply streams data from the I2S hardware to its 2 output ports.</p>
+	<h3>Hardware</h3>
+	<p>The I2S signals are used in "slave" mode, where the I2S device controls
+		data timing.</p>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>
+		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>
+		<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr>
+		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>
+	</table>
+	<!--<h3>Examples</h3>
+	<p class=exam>File &gt; Examples &gt; Audio &gt; 
+	</p>-->
+	<h3>Notes</h3>
+	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and
+		PWM</b> signals.  Differences in timing between the I2S device and
+		Teensy's clock can cause occasional audio glitches when I2S slave mode
+		is used together with other input or output objects based on Teensy's
+		timing.</p>
+	<p>Only one I2S input and one I2S output object may be used.  Master
+		and slave modes may not be mixed (both must be of the same type).
+	</p>
+</script>
+<script type="text/x-red" data-template-name="AudioInputI2Sslave">
+	<div class="form-row">
+		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+		<input type="text" id="node-input-name" placeholder="Name">
+	</div>
+</script>
+
+
+
 
 <script type="text/javascript">
 	RED.nodes.registerType('AudioOutputI2S',{
 </script>
 
 
-
 <script type="text/javascript">
-	RED.nodes.registerType('AudioOutputI2Sslave',{
-	shortName: "i2ss",
+	RED.nodes.registerType('AudioOutputSPDIF',{
+	shortName: "spdif",
 		inputs:2,
 		outputs:0,
 		category: 'output-function',
 		icon: "arrow-in.png"
 	});
 </script>
-<script type="text/x-red" data-help-name="AudioOutputI2Sslave">
+<script type="text/x-red" data-help-name="AudioOutputSPDIF">
 	<h3>Summary</h3>
-	<p>Transmit 16 bit stereo audio to an I2S device using I2S slave mode.</p>
+	<p>Transmit 16 bit stereo audio as Digital S/PDIF.</p>
+	<p align=center><img src="spdif_proto.jpg"></p>
 	<h3>Audio Connections</h3>
 	<table class=doc align=center cellpadding=3>
 		<tr class=top><th>Port</th><th>Purpose</th></tr>
 	</table>
 	<h3>Functions</h3>
 	<p>This object has no functions to call from the Arduino sketch.  It
-		simply streams data from its 2 input ports to the I2S hardware.</p>
+		simply streams data from its 2 input ports S/PDIF encoded digital
+		audio on pin 22.</p>
 	<h3>Hardware</h3>
-	<p>The I2S signals are used in "slave" mode, where the I2S device controls
-		data timing.</p>
+	<p>The S/PDIF output signal can be used to drive an optical TOSLINK
+		cable, or a standard (usually orange) RCA jack.</p>
 	<table class=doc align=center cellpadding=3>
 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>
-		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>
-		<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr>
-		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>
+		<tr class=odd><td align=center>22</td><td>S/PDIF</td><td>Output</td></tr>
 	</table>
+	<p>For optical TOSLINK output, this
+		<a href="https://www.oshpark.com/shared_projects/KcDBKHta" target="_blank">OSH Park board</a>
+		can be used with the inexpensive Everlight PLT133/T6A connector, available
+		at Digikey, 1080-1434-ND.
+		</p>
 	<h3>Examples</h3>
-	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WM8731MikroSine
+	<p>The AudioOutputSPDIF object can be used in place of the AudioOutputI2S object,
+	<p>used in nearly all the examples.  The WavFilePlayer shows how to substitute
+		output objects for different hardware types.
+	</p>
+	<p class=exam>File &gt; Examples &gt; Audio &gt; WavFilePlayer
 	</p>
+	<h3>Credits</h3>
+	<p><a href="https://github.com/FrankBoesing" target="_blank">Frank Boesing</a>
+		developed the AudioOutputSPDIF code.  The original
+		<a href="https://forum.pjrc.com/threads/28639-S-pdif" target="_blank">forum disussion</a>
+		included valuable input and code from "kpc".
 	<h3>Notes</h3>
-	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and
-		PWM</b> signals.  Differences in timing between the I2S device and
-		Teensy's clock can cause occasional audio glitches when I2S slave mode
-		is used together with other input or output objects based on Teensy's
-		timing.</p>
-	<p>Only one I2S input and one I2S output object may be used.  Master
-		and slave modes may not be mixed (both must be of the same type).
+	<p>S/PDIF output uses the I2S hardware.  This object can not be used
+		together with any of the I2S objects, because it requires the I2S
+		hardware with different internal settings.</p>
 	</p>
 </script>
-<script type="text/x-red" data-template-name="AudioOutputI2Sslave">
+<script type="text/x-red" data-template-name="AudioOutputI2S">
 	<div class="form-row">
 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
 		<input type="text" id="node-input-name" placeholder="Name">
 </script>
 
 
-
-
 <script type="text/javascript">
 	RED.nodes.registerType('AudioOutputAnalog',{
 	shortName: "dac",
 </script>
 
 
+<script type="text/javascript">
+	RED.nodes.registerType('AudioOutputI2Sslave',{
+	shortName: "i2ss",
+		inputs:2,
+		outputs:0,
+		category: 'output-function',
+		color:"#E6E0F8",
+		icon: "arrow-in.png"
+	});
+</script>
+<script type="text/x-red" data-help-name="AudioOutputI2Sslave">
+	<h3>Summary</h3>
+	<p>Transmit 16 bit stereo audio to an I2S device using I2S slave mode.</p>
+	<h3>Audio Connections</h3>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Port</th><th>Purpose</th></tr>
+		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>
+		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>
+	</table>
+	<h3>Functions</h3>
+	<p>This object has no functions to call from the Arduino sketch.  It
+		simply streams data from its 2 input ports to the I2S hardware.</p>
+	<h3>Hardware</h3>
+	<p>The I2S signals are used in "slave" mode, where the I2S device controls
+		data timing.</p>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>
+		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>
+		<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr>
+		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>
+	</table>
+	<h3>Examples</h3>
+	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WM8731MikroSine
+	</p>
+	<h3>Notes</h3>
+	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and
+		PWM</b> signals.  Differences in timing between the I2S device and
+		Teensy's clock can cause occasional audio glitches when I2S slave mode
+		is used together with other input or output objects based on Teensy's
+		timing.</p>
+	<p>Only one I2S input and one I2S output object may be used.  Master
+		and slave modes may not be mixed (both must be of the same type).
+	</p>
+</script>
+<script type="text/x-red" data-template-name="AudioOutputI2Sslave">
+	<div class="form-row">
+		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+		<input type="text" id="node-input-name" placeholder="Name">
+	</div>
+</script>
+
+
 <script type="text/javascript">
 	RED.nodes.registerType('AudioMixer4',{
 	shortName: "mixer",
 	It does this by sampling from a delay line, so each voice is actually
 	the same but at a slightly different point in time. This is a type of
 	comb filtering.</p>
-	<p>Chorus combines one or more samples ranging from the most recent 
-	sample back to about 50ms ago. The additional samples are evenly spread 
+	<p>Chorus combines one or more samples ranging from the most recent
+	sample back to about 50ms ago. The additional samples are evenly spread
 	through the supplied delay line, and there is no modulation.</p>
-	<p>If the number of voices is specified as 2, then the 
-	effect combines the current sample and the oldest sample (the last one 
-	in the delay line). If the number of voices is 3 then the effect combines 
-	the most recent sample, the oldest sample and the sample in the middle of 
+	<p>If the number of voices is specified as 2, then the
+	effect combines the current sample and the oldest sample (the last one
+	in the delay line). If the number of voices is 3 then the effect combines
+	the most recent sample, the oldest sample and the sample in the middle of
 	the delay line.</p>
 	<p>For two voices the effect can be represented as:<br/>
 	result = (sample(0) + sample(dt))/2<br/>
-	where sample(0) represents the current sample and sample(dt) 
+	where sample(0) represents the current sample and sample(dt)
 	is the sample in the delay line from dt milliseconds ago.</p>
 	<h3>Audio Connections</h3>
 	<table class=doc align=center cellpadding=3>
 	<h3>Functions</h3>
 	<p class=func><span class=keyword>begin</span>(delayBuffer, length, n_chorus);</p>
 	<p class=desc>Create a chorus by specifying the address of the delayline, the
-	total number of samples in the delay line (often done as an integer multiple of 
+	total number of samples in the delay line (often done as an integer multiple of
 	AUDIO_BLOCK_SAMPLES) and the number of voices in the chorus <em>including</em>
-	the original voice (so, 2 and up to get a chorus effect, although you can 
+	the original voice (so, 2 and up to get a chorus effect, although you can
 	specify 1 if you want).
 	</p>
 	<p class=func><span class=keyword>modify</span>(n_chorus);</p>
 </script>
 <script type="text/x-red" data-help-name="AudioEffectFlange">
 <h3>Summary</h3>
-	<p>Originally, flanging was produced by playing the same signal on two synchronized 
+	<p>Originally, flanging was produced by playing the same signal on two synchronized
 	reel-to-reel tape recorders and making one of the reels slow down and speed up by
 	pressing on the flange of the reel (hence the name). This is a type of
-	comb filtering, and produces a harmonically-related series of peaks and notches 
+	comb filtering, and produces a harmonically-related series of peaks and notches
 	in the audio spectrum.</p>
-	<p>This flanger uses a delay line, combining the original voice with only one sample from the delay 
+	<p>This flanger uses a delay line, combining the original voice with only one sample from the delay
 	line, but the position of that sample varies sinusoidally.</p>
 	<p>The effect can be represented as:<br>
 	result = sample(0) + sample(dt + depth*sin(2*PI*Fe))</p>
-	<p>The value of the sine function is always a number from -1 to +1 and 
-	so the result of depth*(sin(Fe)) is always a number from -depth to +depth. 
-	Thus, the delayed sample will be selected from the range (dt-depth) to 
-	(dt+depth). This selection will vary at whatever rate is specified as the 
+	<p>The value of the sine function is always a number from -1 to +1 and
+	so the result of depth*(sin(Fe)) is always a number from -depth to +depth.
+	Thus, the delayed sample will be selected from the range (dt-depth) to
+	(dt+depth). This selection will vary at whatever rate is specified as the
 	frequency of the effect, Fe. Typically a low frequency (a few Hertz) is used.
 	<h3>Audio Connections</h3>
 	<table class=doc align=center cellpadding=3>
 	<h3>Functions</h3>
 	<p class=func><span class=keyword>begin</span>(delayBuffer, length, offset, depth, delayRate);</p>
 	<p class=desc>Create a flanger by specifying the address of the delayline, the
-	total number of samples in the delay line (often done as an integer multiple of 
+	total number of samples in the delay line (often done as an integer multiple of
 	AUDIO_BLOCK_SAMPLES), the offset (how far back the flanged sample is from the original voice),
 	the modulation depth (larger values give a greater variation) and the modulation
 	frequency, in Hertz.
 		changes the analog gain in the headphone amplifier.  This function
 		on the other hand controls digital attenuation before conversion to analog, which
 		reduces resolution, but allows another fine control of output
-		signal level.  The ranges is 0 to 1.0, with the default (no digital attenuation) 
+		signal level.  The ranges is 0 to 1.0, with the default (no digital attenuation)
 		at 1.0.
 	</p>
-	<p  class=desc>dacVolume uses zero-crossing detect to avoid clicks, and ramping is handled by 
+	<p  class=desc>dacVolume uses zero-crossing detect to avoid clicks, and ramping is handled by
 	the chip so that a new volume may be set directly in a single call.
 	</p>
 	<p class=func><span class=keyword>dacVolume</span>(left, right);</p>
 
 	<h3>Audio Processor</h3>
 
-	<p>The optional digital audio processor is capable of implementing 
+	<p>The optional digital audio processor is capable of implementing
 		one or more of: automatic volume control, surround sound control,
 		bass enhancement, and tonal adjustments (either a
 		simple tone control, or a parametric equalizer, or a graphic equalizer),
 		in that order.
 	</p>
 	<p>These signal processing features are implemented in the SGTL5000 chip,
-		so they do not consume CPU time on Teensy. However, the order of 
+		so they do not consume CPU time on Teensy. However, the order of
 		these processes is fixed in the hardware.
 	</p>
-	<p>It is good practice to mute the outputs before enabling or disabling 
+	<p>It is good practice to mute the outputs before enabling or disabling
 	the Audio Processor, to avoid clicks or thumps.
 	</p>
 
 	four values: 0 (0ms), 1 (25ms), 2 (50ms) or 3 (100ms). Larger values average the volume
 	over a longer time, allowing short-term peaks through.
 	</p>
-	<p class=desc>If <em>hardLimit</em> is 0, a 'soft 
-	knee' compressor is used to progressively compress louder values which are near to or above the 
-	threashold (the louder they are, the greater the compression). If it is 1, a hard compressor 
+	<p class=desc>If <em>hardLimit</em> is 0, a 'soft
+	knee' compressor is used to progressively compress louder values which are near to or above the
+	threashold (the louder they are, the greater the compression). If it is 1, a hard compressor
 	is used (all values above the threashold are the same loudness). The <em>threashold</em> is specified
-	as a float in the range 0dBFS to -96dBFS, where -18dBFS is a typical value. 
-	<em>attack</em> is a float controlling the rate of decrease in gain when the signal is over 
+	as a float in the range 0dBFS to -96dBFS, where -18dBFS is a typical value.
+	<em>attack</em> is a float controlling the rate of decrease in gain when the signal is over
 	threashold, in dB/s. <em>decay</em> controls how fast gain is restored once the level
 	drops below threashold, again in dB/s. It is typically set to a longer value than attack.
 	</p>
 	</p>
 
 	<p class=func><span class=keyword>surroundSoundEnable</span>();</p>
-	<p class=desc>Enable virtual surround processing, to give a broader and 
+	<p class=desc>Enable virtual surround processing, to give a broader and
 	deeper stereo image (even with mono input).
 	</p>
 	<p class=func><span class=keyword>surroundSoundDisable</span>();</p>
 	<p class=desc>Configures virtual surround width from 0 (mono) to 7 (widest).
 	<em>select</em> may be set to 1 (disable), 2 (mono input) or 3 (stereo input).
 	</p>
-	
+
 	<p class=func><span class=keyword>enhanceBassEnable</span>();</p>
 	<p class=desc>Enable bass enhancement. A mono, low-pass filtered copy of
 	the original stereo signal has bass levels boosted and is then mixed back into
-	the stereo signal, which is then optionally high pass filtered (to remove 
+	the stereo signal, which is then optionally high pass filtered (to remove
 	inaudible subsonic frequencies).
 	</p>
 	<p class=func><span class=keyword>enhanceBassDisable</span>();</p>
-	<p class=desc>Disable bass enhancement. Before disabling, ramp down the bass 
+	<p class=desc>Disable bass enhancement. Before disabling, ramp down the bass
 	enhancement level to zero.
 	</p>
 	<p class=func><span class=keyword>enhanceBass</span>(lr_lev, bass_lev);</p>
-	<p class=desc>Configures the bass enhancement by setting the levels of the 
+	<p class=desc>Configures the bass enhancement by setting the levels of the
 	original stereo signal and the bass-enhanced mono level which will be mixed together.
 	There is no high-pass filter.
 	</p>
-	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in 
+	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in
 	steps of 0.5dB, to avoid pops.
 	</p>
 	<p class=func><span class=keyword>enhanceBass</span>(lr_lev, bass_lev, hpf_bypass, cutoff);</p>
-	<p class=desc>Configures the bass enhancement by setting the levels of the 
+	<p class=desc>Configures the bass enhancement by setting the levels of the
 	original stereo signal and the bass-enhanced mono level which will be mixed together.
 	The high-pass filter may be enabled (0) or bypassed (1). The cutoff frequency is specified
 	as follows:
  5     200Hz
  6     225Hz
 </pre>
-	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in 
+	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in
 	steps of 0.5dB, to avoid pops.
 	</p>
-	
+
 	<p class=func><span class=keyword>eqSelect</span>(n);</p>
-	<p class=desc>Selects the type of frequency control, where <em>n</em> is 
+	<p class=desc>Selects the type of frequency control, where <em>n</em> is
 	one of</p>
 	<p class=desc><b>FLAT_FREQUENCY (0)</b><br>
     Equalizers and tone controls disabled, flat frequency response.</p>
     <p class=desc><b>PARAMETRIC_EQUALIZER (1)</b><br>
-    Enables the 7-band parametric equalizer, thus disabling the 
+    Enables the 7-band parametric equalizer, thus disabling the
 	tone controls and graphic equalizer.</p>
     <p class=desc><b>TONE_CONTROLS (2)</b><br>
-    Enables bass and treble tone controls, disabling the parametric 
+    Enables bass and treble tone controls, disabling the parametric
 	equalization and graphic equalizer.</p>
     <p class=desc><b>GRAPHIC_EQUALIZER (3)</b><br>
-    Enables the five-band graphic equalizer, disabling the parametric 
+    Enables the five-band graphic equalizer, disabling the parametric
 	equalization and tone controls.</p>
 
-	
+
 	<p class=func><span class=keyword>eqBands</span>(bass, treble);</p>
 	<p class=desc>Configures bass and treble tone controls, which are
-	implemented as one second order low pass filter (bass) in parallel with 
-	one second order high pass filter (treble). 
+	implemented as one second order low pass filter (bass) in parallel with
+	one second order high pass filter (treble).
 	</p>
-	<p class=desc>When changing bass or treble level, call this function repeatedly to ramp 
+	<p class=desc>When changing bass or treble level, call this function repeatedly to ramp
 	up or down the level in steps of 0.04 (=0.5dB) or so, to avoid pops.
 	</p>
 	<p class=func><span class=keyword>eqBands</span>(bass, mid_bass, midrange, mid_treble, treble);</p>
-	<p class=desc>Configures the graphic equalizer. It is implemented by five parallel, 
-	second order biquad filters with fixed frequencies of 115Hz, 330Hz, 990Hz, 3kHz, 
+	<p class=desc>Configures the graphic equalizer. It is implemented by five parallel,
+	second order biquad filters with fixed frequencies of 115Hz, 330Hz, 990Hz, 3kHz,
 	and 9.9kHz. Each band has a range of adjustment from 1.00 (+12dB) to -1.00 (-11.75dB).
 	</p>
 	<p class=func><span class=keyword>eqBand</span>(bandNum, n);</p>
 	<p  class=desc>When changing a band, call this function repeatedly to ramp up the gain in steps of 0.5dB,
 	to avoid pops.
 	</p>
-	
+
 	<p class=func><span class=keyword>eqFilter</span>(filterNum, filterParameters);</p>
-	<p class=desc>Configurs the parametric equalizer. The number of filters (1 to 7) 
-	is specified along with  a pointer to an array of filter coefficients. 
-	The parametric equalizer is implemented using 7 cascaded, second order bi-quad 
-	filters whose frequencies, gain, and Q may be freely configured, but each filter 
+	<p class=desc>Configurs the parametric equalizer. The number of filters (1 to 7)
+	is specified along with  a pointer to an array of filter coefficients.
+	The parametric equalizer is implemented using 7 cascaded, second order bi-quad
+	filters whose frequencies, gain, and Q may be freely configured, but each filter
 	can only be specified as a set of filter coefficients.
 	</p>
 	<p class=func><span class=keyword>eqFilterCount</span>(n);</p>
 	<p class=desc>Enables zero or more of the already enabled parametric filters.
-	</p>	
-	
+	</p>
+
 	<h3>Examples</h3>
 	<p>Nearly all of the library's examples use this object.  These
 		examples demonstrate its special features.
 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; CalcBiquadToneControlDAP
 	</p>
 	<h3>Notes</h3>
-	<p>TODO: add example with rock/classical/speech presets, where rock uses bass boost 
+	<p>TODO: add example with rock/classical/speech presets, where rock uses bass boost
 	and surround enhancement while speech uses bandpass filtering and auto volume control
 	compression.
 	</p>
 	<h3>Audio Connections</h3>
 	<p>This object has no audio inputs or outputs.  Separate i2s objects
 		are used to send and receive audio data.  I2S master mode objects
-		must be used, since this control object configures the WM8731 into 
+		must be used, since this control object configures the WM8731 into
 		slave mode.
 	</p>
 	<h3>Functions</h3>
 	<p class=desc>not implemented
 	</p>
 	<!--<h3>Examples</h3>
-	<p class=exam>File &gt; Examples &gt; Audio &gt; 
+	<p class=exam>File &gt; Examples &gt; Audio &gt;
 	</p>-->
 	<h3>Notes</h3>
 	<p></p>