[sdiy] SH101 MIDI Mod problem

[rob]

This is not played from a sequencer, but from live
playing - and the notes' pitches are imperfect whether
they overlap or not....


> Before you dig into hardware issues, try shortening
> your notes a few ticks
> and see what happens...
> 
> IIRC the sh101 uses an auto-porta circuit that
> detects legato notes via CV
> control. If there is a gap between two notes, it
> disables portamento for the
> second note.
> 
> Now the question here is how long must this gap be
> before the sh101
> considers it a 'gap'?
> 
> If your midi sequencer is playing quarter notes back
> to back for example,
> without legato the gap is likely to be 1ms (the time
> it takes for 3 midi
> bytes to transmit between note-off and note-on).
> 
> Perhaps the SH101 auto-porta sensing circuit is only
> partially shutting off
> because 1ms is too short?
> 
> Another possible cause would be if the Gate CV
> switches on before the pitch
> CV settles to the new note. In this case you might
> be able to delay the gate
> slightly using an RC circuit...
> 
> -Dan G.
> 


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