Tested running 100.000 sin() calls and it took 2594 milliseconds. That means you make call sin() at 38.55kHz. If you want to make 44.1kHz sound in real-time there’s no way you can use the sin() method.

Here’s the code I used

for (uint32_t i=0; i<10000; i++) { f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); f=sin(f); } Serial.println(millis()); Serial.println(f); }