Akai AX60 Resonance Modification

This modification smooths out the response of the resonance slider, which is known to be pretty nasty. What I did was put a resistor in series with the resonance pot to limit the voltage to a range closer to what's recommended in the CEM3394 datasheet (2.5v vs. 4.13v). Now I get a very smooth response, with self-oscillation when the slider is at about 95%, instead of the typical 40%. Makes the synth feel much less angry. I got the idea from this analysis.

All you have to do is cut the 4.13v trace on each side of the resonance slider pin, and add a 4.7k resistor in series with the slider, connecting back to the 4.13v trace. This brings the max resonance voltage down to about 2.4v (enough to get it oscillating), instead of 4.13v. Make sure to reconnect that 4.13v trace around the resonance pin, or the sliders to the right will not function.

Recording of modded AX60 (processing an S612 sample of the 808 cowbell):