Add a type template parameter to `AudioDelayFeedback` #719

Job	Run time
debounce	1s
arduino:avr:uno	1m 59s
arduino:avr:mega	2m 5s
esp8266:esp8266:huzzah	5m 28s
STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8	8m 12s
arduino:mbed_giga:giga	10m 13s
arduino:samd:adafruit_circuitplayground_m0	2m 25s
rp2040:rp2040:rpipico	6m 30s
arduino:renesas_uno:minima	3m 52s
teensy:avr:teensy36	4m 41s
teensy:avr:teensy41	4m 24s
report	20s
	50m 10s

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