<p>Using a tighter tolerance wont make the circuit sound BETTER. it's just more likely to sound as intended since the values will be more exact. The only place I use them is when I am reproducing a function several times within the same circuit... like the pitch of an oscillator. If you want all of the oscillators to be the same pitch, the vital components (the pitch resistor and capacitor) should be tighter tolerances. It always depends on the circuit but most stuff I work on has lots of room for value tolerance. I try to keep the number of values as low as possible and use lots of 10k and 100k resistors where I can.
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