use cmsis library for arm_math.h

include/audio/analyze_fft1024.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 // windows.c
 extern "C" {

include/audio/analyze_fft256.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 // windows.c
 extern "C" {

include/audio/async_input_spdif3.h

 #include <core/Arduino.h>
 #include <core/AudioStream.h>
 #include <core/DMAChannel.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 //#define DEBUG_SPDIF_IN	//activates debug output
 

include/audio/biquad.h

 #define biquad_coeffs_h_
 
 #include <core/Arduino.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 #include <type_traits>
 
 enum class BiquadType {

include/audio/filter_fir.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 // Indicates that the code should just pass through the audio
 // without any filtering (as opposed to doing nothing at all)

include/audio/synth_pwm.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 class AudioSynthWaveformPWM : public AudioStream
 {

include/audio/synth_sine.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 // TODO: investigate making a high resolution sine wave
 // using Taylor series expansion.

include/audio/synth_waveform.h

 
 #include <core/Arduino.h>
 #include <core/AudioStream.h>
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 // waveforms.c
 extern "C" {

library.json5

 		'teensy/serial-flash',
 		'teensy/sd',
 		'teensy/spi',
+		'cmsis/dsp',
 	],
 }

package.json5

 		'teensy-serial-flash^1.0.0',
 		'teensy-sd^1.2.2',
 		'teensy-spi^1.0.0',
+		'cmsis^5.7.0',
 	],
 }

src/audio/analyze_notefreq.cpp

 #include <core/Arduino.h>
 #include "audio/analyze_notefreq.h"
 #include "audio/utility/dspinst.h"
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 #define HALF_BLOCKS AUDIO_GUITARTUNER_BLOCKS * 64
 

src/audio/effect_flange.cpp

 
 #include <core/Arduino.h>
 #include "audio/effect_flange.h"
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 /******************************************************************/
 //                A u d i o E f f e c t F l a n g e

src/audio/synth_tonesweep.cpp

 
 #include <core/Arduino.h>
 #include "audio/synth_tonesweep.h"
-#include <core/arm_math.h>
+#include <arm_math.h>
 
 
 

src/audio/synth_waveform.cpp

 
 #include <core/Arduino.h>
 #include "audio/synth_waveform.h"
-#include <core/arm_math.h>
+#include <arm_math.h>
 #include "audio/utility/dspinst.h"