@SP.  Yes. IM using OVOX to do this, but can't figure out how to use it with ACID. in the OVOX tutorial it says to route the audio track to a midi track.

@H.J I don't think that this is possible in ACID. It looks like the audio tracks don't have a MIDI out option. But I got it working with Plogue Bidule. I would suggest you try the free standalone demo of this program. This is a excellent program and plugin that can host other plugins and you can build plugin chains and route them inside it like you want. You can only test the standalone version but it is enough to learn how it works.

https://www.plogue.com/products/bidule.html

First you must install Bidule and set up it preferences. You start the standalone version and add and scan your VST paths under Edit > Preferences > VST.

You can then add audio inputs and outputs and your VST effects and instruments with a right click on the canvas.

Create a chain with your audio device (you can also add just an audio file player with Right Click > Audio File > Player as an input). Then add OVox, then add a VST synth and then add your output device. To save your ears from damage you should add a limiter before the output!

For example, I added my Focusrite USB Audio device as an input and output but loaded a soundfile inside an Audio File Player. Then I linked the outputs of the player to the inputs of OVox and the MIDI output of OVox to the MIDI inpute of a uHe Diva synth. Then I connected the output of the synth to a limiter (for safety reasons) and then to the audio device output.

You can load the paid version of Bidule as a VST effect plugin your audio track in ACID. The following chain uses a MIDI output node. You can add MIDI input and output nodes on the canvas and connect them to any DAW on your computer. You can download free virtual MIDI cables here https://www.tobias-erichsen.de/software/loopmidi.html or here https://www.nerds.de/en/loopbe1.html

I personally use loopBe30. The MIDI device is called "Internal MIDI" in my case. Like I said, I load Bidule as an VST effect on the audio channel and connect the incomming audio signal to OVox and the OVox MIDI output to my Internal MIDI. Then I use Internal MIDI as an input device for the MIDI track in ACID and can play the Magix DN-e1 synth with the output of OVox. It works!

In my opinion Plogue Bidule with some virtual MIDI cables is worth every penny. You can also save your plugin chains and load them up in other DAWs. With this you can easily exchange your presets between different DAWs.