Rendering External MIDI Device to Audio

I think I have most of the parts in place. The summary of my issue is that when I create an instrument track from the External Device I created, copy an adjacent MIDI part from a MIDI track on a specific channel, when rendering in place, the audio track produced has the playback from all the other midi channels. How do I only render one MIDI channel at a time?

In this example I have 8 MIDI tracks individually on Channels 1-8. I want to render all to audio tracks. All channels route to the same external device (Proteus/1). My understanding is that I cannot render all (any) MIDI tracks/events simultaneously or without creating an External Instrument.

What am I missing? Am I going about this the wrong way? Thx!

Basically your external synth (Proteus) is mixing the signal of all 8 channels internally before outputting them to Cubase. If you have a synth with two stereo outputs you could record two seperate signals at the same time.
Try soloing the track that you want to render. If you have the Proteus defined as an External Instrument you should be able to use Render In Place. Otherwise you will have to manually record the output of your synth.

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I see. Since the synth only returns a stereo signal, Cubase cannot separate the Rendering to audio by midi channel.

This is a rather slow process, rendering one channel at a time using a dedicated output. I wanted to be certain that is how most people have to do it. I am converting a lot of old multi channel MID files.

Thanks for your help.

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It is not only “most”, it is “everybody”.
Part of why VST instruments were so successful is that they are much more comfortable to work with in many areas, like preset handling, total recall, rendering to audio, …

On the off chance this may help, this link purports to be the Proteus XV software version of the (or “a”) Proteus hardware synth:

It says it will run on Win10x64, so if it’s legit, that may help you out.

The Emulator X may be an even better solution:

Note I’m not vouching for or otherwise confirming they are suitable for any purpose. Just giving a potential solution that could possibly save you lots of time while hopefully retaining general patch replication.