Thanks so much Gary, as always. I'll try the tests you suggested (different channel/CC, rebuilding from scratch) and let you know how it goes. In the meantime the project keeps moving forward, even if it sometimes has to 'sidestep' — today I'll probably take a different route, but your help on these details is always invaluable for understanding where the problem really lies. Stubbornly onward :-)

M.

Thought: If you assign Fader(s) 2,3 etc. to a different instrument out and/or a different MIDI channel, will they work along with Fader 1 then?

* No magic revelation here, just exploring all of the variables in search of one.

Try QuicKeys.

That worked thanks!

First, thanks for being one of the few who understand the importance of details and accuracy when dealing with complex issues. It helps……

usually

Answers:
Is this a known limitation/bug  of the Faders Window, ? NO
Is there a setting I'm missing…  also, NO

Hard as I try, I cannot replicate your problem. The Faders are as simple as it gets and they should all work… period. This is probably where you should rebuild doremidi from scratch - first in OMS, then in the Instruments window/setup. Also, try a different MIDI channel and different CC #’s. Long shots, yes but that’s what you do when you’re out of ideas.

Last stop on this train: Is this Studio Vision Pro 4.5.1 OR is it Studio Vision Pro DSP?
There’s always the small possibility of a teeny software bug. The very last thing is to try a completely different copy / version from a different source. Yeah I know, it hurts just to type that out let alone actually do it.

If I think of anything else I’ll holler back.

Hi Gary,  yes, the little mixer is already working, and as soon as there's something more structured, I'll be happy to share with the community who helped me. ;-)

Subject: Faders Window in Vision/Studio Vision Pro 4.5 — only Fader 1 transmits, F2-F6 send nothing
Hardware/software setup:

PowerBook G3 Wallstreet, Mac OS 9.2
Opcode Studio Vision Pro 4.5 (freeware/DSP version)
MIDI interface: Opcode Studio 4, managed via OMS 2.3.8
 assigned as Instrument "doremidi-1" on Studio4 OUT2, MIDI channel 1

This aspect is somehow related to the rest of my project, described in another post

What works (verified and confirmed):

The full MIDI chain (Vision → OMS → Studio4 → DMX → fixture) is confirmed 100% healthy: manually inserting six Controller events (CC1-CC6) in a track's List Window, all six transmit correctly and the DMX fixture responds on all channels without exception.
The problem:

In the Faders Window, I assigned six faders (F1-F6) all to the same Instrument ", in Send mode, each to a different Controller (F1=CC1, F2=CC2, F3=CC3, F4=CC4, F5=CC5, F6=CC6). All selector dots are active (hollow triangle, not filled dot). The on-screen assignments are correct and confirmed via screenshots.
Moving F1 with the mouse, the command transmits correctly, regardless of which Controller is assigned to it (tested by reassigning F1 to all six controllers one at a time: it always works).
Moving any other fader (F2, F3, F4, F5, F6), nothing is transmitted at all, even when disabling F1 and leaving only one other fader active at a time (so it's not a conflict between multiple simultaneously active faders: it's specific to fader position — only F1 ever works).
Question for the forum:

Is this a known limitation/bug  of the Faders Window, ? Is there a setting I'm missing (in the Faders Window menu, or in Preferences) that could explain why only the first fader in the column transmits in Send mode?
thanks for you attention

Try QuicKeys.

Good evening gentlemen

I am discovering excellent applications such as:

Smart Launch
https://macintoshgarden.org/apps/smartlaunch-made-realbasic

and

TypeLaunch
https://macintoshgarden.org/apps/typelaunch

These applications bring a much-missed capability from OSX Tiger (or from the launch of Quicksilver, which I remember being first but maybr I’m wrong) onwards: pressing cmd-space, typing an application name, and pressing return to launch that application, whereupon the launcher that was invoked vanishes.

The only problem is, I can’t find any way to use the cmd-space shortcut on Mac OS 9.2.2. It’s totally blocked off for system use, to change keyboard inputs.

I’m itching to take advantage of all that muscle memory on OS9. Anyone know of a way?

Thanks!

Try this driver.

same Prob with less options in the Mixer app

Rock on makott !
There's nothing quite like the feeling when you realize you've finally succeeded working a problem that's kept you stuck in place for a long time.

I'll be anticipating seeing at least a small part of the results on YouTube or such in the future. 

Gary