MOTM

> On my Roland JV-1000 it's called 'Legato'... Other synths may have other
> names for it, kind of like 'Glide' vs 'Portamento'... The 820 itself
doesn't
> do this however the 820 does have CV control of the 'Bypass', 'Up', 'Down'
> or 'Up/Down'.

A trick that could work is to switch the LAG to Bypass for a very short time
with the "Trigger" pulse from your Keyboard or Midi Interface.

When you play Legato, no Trigger pulse is created (only Gate), so you have
Portamento. When you play staccato, the Trigger pulse will bypass the Lag
for a very short time (which could be enough, because the Lag is switched
to "very fast" in that time.

Please note that I have *not* tried this with a 820. (But I implemented that
function into an old synth of mine.) It may be necessary to prolong the
Trigger pulse a little (try a ASDR with S=0 and D=50ms), and/or to invert it
and use the normal CV inputs - experiment !

JH.