A real MSR+ and the vMSR have nothing in common other than the name and what it looks like on screen.

MSR+ uses an IR protocol that is generally common between devices, save for a couple of minor differences that are largely compatible in one form or another across versions.

vMSR protocol is RS232 and it would appear that there is far less control code commonality between versions let alone devices. The vMSR app would needs to map the on screen buttons with RS232 control codes for each different device it is connected to. For some devices this is well documented and they can probably be interrogated by vMSR to automatically determine the device. However, for other devices and versions, this is not the case which sounds to be the case you are finding.

Its not a case of emulating MSR4 codes, it a case of transmitting the set of codes that best match the device RS232 command set and thats only assuming it's able to determine the device its talking to in the first place.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).