On Wed, 2011-01-26 at 12:54 -0800, David Brown wrote: > The trick was to make the DAC reference voltage 10.666 volts so that > semitones are exactly on value every 32 steps. This eliminates the > additional digitization errors due to the DAC resolution. Ah! That's why the TB303 runs the DAC buffer off of 5.33V! Gordon MM0YEQ