Nice stereo I2S 16-bit 48kHz is like 1 USD chip. Plus I2S is very efficient to implement with the RP2040 PIO hardware. You can even use the blocking write call

Nice stereo I2S 16-bit 48kHz is like 1 USD chip. Plus I2S is very efficient to implement with the RP2040 PIO hardware. You can even use the blocking write call to time the signal without any timers or callbacks necessary.