Hello Mick,
Sorry for the tardy reply. It has been a little busy lately.
The output of your Veron when set to MM will be 40 dB.
I’m afraid it will take a lot of circuit surgery and 4 additional CCS boards to change your Version to the latest MM version, which uses different valves in a different circuit topology. This would cost around £300 plus shipping costs. Also it would be Summer before I could do this, as I have a lot of work to catch up with after my recent enforced absence from work due to the hernia operation.
Regards,
Paul