Akai VX-90 Analog Midi Rack Synth w/ Filter Input Mod

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"This synth has a rare mod, the sampler input has been replaced by 6 jacks on the back for vcf signal path input. That means you can insert your own sounds into the signal path to be processed by the vx 90s filters, lfo, and envelope. On the synth menu, you select "sampler" as a waveform to use this mod. If you look at picture 2, you can see the modification- the sampler input has been removed, and six holes have been machined for the vcf inputs. you will notice that 2 of the holes seem to be empty; that is because the threaded washers became loose and fell off--the jacks are still connected inside the synth, they fell back into the case, you will have to unscrew the case and put them back through the holes and put threaded washers back on..."