MIDI for the EML 101

From Nicholas D. Kent
Sent Fri, Oct 31st 1997, 14:31

After many hours and arhive info from Analog Heaven I managed to
sucessfully kludge sucessfully (monophonic) scaling and gating MIDI to
CV to EML.

I don't claim to have much electronic circuitry knowledge or know about
undocumented variations in EML 101 design, so don't blame me if I'm
giving bad advice.

1) Get the unit to scale from the keyboard. I used a digital tuner.

While I was at it the CV out from the keyboard is 0.1 volt per key = 1.2
volt per octave. The CV patch jacks at the top worked but not at
1.2v/oct but at several times this number. I found them usable only for
non-pitched modulation. As documented the Envelope Trig jack needs a
gate present, and there is no gate in on the patch pannel. So I went for
the keyboard connection jack.

Anyone know what the SEQ IN does? I still haven't figured it out, but
once I got weird modulation when I patched to it. Never figured out what
I was doing.

2) Looking at the Synth unit keyboard socket from the outside the pin at
2 o'clock is the CV. and the one at the bottom (6 o'clock) is a gate. I
left the other pins connected to the keyboard.

3)  I connected both to a Kenton Pro4. But at the full amount of
scaling, supposedly about 120%, I only got C to B or so for the octave.
Darn. So what I did was take two channels and fed them through a voltage
mixer (Doepfer A-138 linear in this case) and attenuated one CV quite
drastically. Playing octave back and forth I got it to scale to whatever
pitch it wound up on in octaves. Then on the EML I tuned the OSCs to C
(the MIDI note I was using). 

A reminder from the archives. You have to keep re-triggering a note and
giving the unit CV to get anything done. Just holding down a note will
not let you scale the unit. (CV is buffered while the gate is held?)
Again, a reminder that the inputs at the top behave very differently.

I didn't figure out how to access the second duophonic CH. It seems to
be on the pin at 8 o'clock. Normally there is a +5 voltage on it, but it
drops to a new voltage when it's not in unison. But I'm not certain if I
acessed this accurately.

nicholas d. kent