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I've just built a dual manual (upper and lower) 2x 61keys using 2x 5 octave velocity sensing key board from Fatar sourced through local Doepfer agent. I've used a standard LPC17 MBHP Core, 2x DIO Matrix PCB, connected as per the excellent doco and instructions set up by TK. It works! There is room beside each keybed for mod wheel and pitchbender. Some observations (and questions): The suggested settings for velocity response are a bit "top heavy" (Meaning the average strike gives a velocity of over a 100). I think I prefer it if its in the 40 to 60 range. This way it is easy to perform accents, more dynamic.I've improved this a little by making delay_slowest smaller say 1000 (the suggested was 2000). Better, but still not proving a very smooth transition from soft-light to heavy-fast.I suspect a concave velocity curve is what I'm after ( with increasing velocity on input, the output velocity increases from left to right on a velocity curve diagram.) Rightmost curve, below.The pitchbend modwheel combo I'm thinking of fitting to each keybed is a Doepfer one. It states on the website that the potentiometer on each wheel does not travel the full distance. In other words, if 0 and 5V is attached, the wiper voltage will only go from 0 to about 1.6V. I assume the best "fix" for this would be in software?The pitchbender has a centering spring, I would assume the software would need to recognize when the bender is "at rest" to provide a pitchbend of "zero"?I would like a sustain pedal for each keybed. I assume the most straight forward interface for this would be the analog (using pullup/down resistor) with each footswitch? (It would mean I'm using all (6) analog inputs.)I've not seen the firmware source code yet, I assume it is/will be available?Thanks TK, for putting together another great midibox project!!!!