Added state processing stage

pwm.c

@@ -2,7 +2,6 @@
 #include <pico/types.h>
 
 #include "const.h"
-#include "state.h"
 #include "synth.h"
 
 #include "pwm.h"
@@ -15,7 +14,6 @@ void pwm_isr(void) {
 	pwm_clear_irq(slice);
 
 	float sample = get_sample();
-	state.dbg_sample = sample;
 
 	uint16_t level = (uint16_t)((sample + 1.0f) * 0.5f * 3400.0f);
 	pwm_set_chan_level(slice, chan, level);