(
MIDIClient.init;
MIDIIn.connectAll;

MIDIFunc.trace(true);
)

(
~synths = Array.fill(127, nil);
MIDIdef.noteOn(\on, {
    arg val, num, chan,src;
    if(~synths[num] == nil, {  // To be absolutely save
        ~synths[num] = Synth(\supersaw, [
            \amp, 0.1,
            \freq, num.midicps,
            \harm, exprand(4,20)]);
    });
});

MIDIdef.noteOff(\off, {
    arg val, num, chan,src;
    if(~synths[num] != nil, {  // To be absolutely safe
        ~synths[num].set(\gate, 0);
        ~synths[num] = nil;    // Remove the reference
    });
});
)