I have my Zoom setup so that any sound on my PC automatically is routed through Zoom, whether it’s Dorico, an audio file, me playing my MIDI keyboard with a standalone VST, YouTube, or speaking mic.
To do this, you need some sort of software that can mix the signals together, then send to Zoom as a virtual microphone. OBS is free and may work for you. I use my Fuji X-T4 as my webcam and OBS isn’t compatible with the Fuji software so I use ManyCam. I’m also using FlexASIO and VoiceMeeter.
When teaching I have a virtual MIDI keyboard always visible at the bottom of the screen so the students can see whatever voicing or line I’m playing on it. Perhaps you don’t need this, but it also is mixed in with the ManyCam video signal.
It’s kinda complicated so I made myself the setting sheet below for troubleshooting. Your devices will obviously vary so just change those as needed, but here’s my basic setup for Zoom so all audio is automatically sent to Zoom all the time:
Windows & VM
Windows Sound Output - CABLE Input (VB-Audio Virtual Cable)
Windows Sound Input - Microphone (MiC Plus)
VoiceMeeter Potato - Hardware Out (A1) - SPL USB Audio Device
Hardware Input 1 - CABLE Output
Hardware Input 2 - Microphone (MiC Plus) - turn off A1
Virtual Input 1 - Voicemeeter VAIO
Bome MIDI Translator - load preset to route MIDI, minimize to system tray
Roon - FlexASIO (Enable sample rate conversion)
VSL Synchon Piano - FlexASIO for Zoom, otherwise VoiceMeeter Virtual ASIO (lower latency than FlexASIO)
Dorico - FlexASIO
Video
VMPK - MIDI Setup - Input MIDI Connection - VMPK Port (hide Window frame too)
Fuji X Webcam 2 software installed
X-T4: Still, Single Shot, USB AUTO, Pre-AF on, Face Detection on - Eye Auto
16mm f/1.4 lens, have aperture at 1.8 when turning on
ManyCam
Import mcpro file with correct window placement for VMPK
Global Sound - On, Preset Audio - On
Audio Inputs (2): System sound, Microphone (MiC Plus),
Audio Output - Default Playback Device (should be CABLE Input)
Zoom
Video: Camera - ManyCam Virtual Webcam
Audio: Speaker - Same as System, Microphone - ManyCam Virtual Microphone
In Zoom, can use Share Screen but do not Share Sound or it won’t work
As long as your video software works with your webcam, I assume you could do something similar with OBS, FlexASIO, and Voicemeeter so all audio automatically goes to Zoom.