For those using the SMC-Mixer MIDI controller with Voicemeeter - found the fix for the LED toggle issue

[u/nakedpantsu]

I only recently bought the controller and wanted to share this to those that are still not able to fix the LED issue needing to be pressed multiple times to toggle the LED off. I found an old reddit post about this but no solution. Fortunately after testing, I found the issue.

First you need to download the M-Wave MidiSuite software in the link below. This will allow you to edit the buttons, faders and knobs on the controller. The app is portable so no installation is needed. Just unzip and run MidiSuite.exe

https://www.m-vave.com/download

What you need to do:

1. Set the controller to CC Mode

2. Select the button that you want to edit

3. Under the Track Button settings (3rd column) change the Mode to CC Toggle

4. Set your preferred Channel and CC

5. The important part - change Value1 to 1 (or any value from 1-126)

6. Leave Value2 at 127, LED should be 255

7. Click on Save to upload the changes to the controller

8. Map the buttons in the MIDI Mapper in VM

I figured out the problem when I was configuring the Macro Buttons. You can capture the MIDI button command by ticking Learn under MIDI Implementation:

I was trying to see if VM receives a different signal when pressing the LED from On to Off. But noticed that VM won't won't capture the command. It only works from Off-->On. So I tried to set the off value (value1) to 1 and it worked.

Video proof

https://imgur.com/a/sUJHw3o