Ceriatone OTS or HRM; how well do they clean up with the guitar's volume pot?

[Mickey64]

Having looked at various ideas for a new amp purchase, I'm looking more seriously now at buying a Ceriatone OTS or HRM head (still undecided), 50 watt. However, can someone here direct me to a clip demonstrating how well the amp cleans up from the guitar's volume pot? That's how I play, and I've been put off various other high quality amps with clean and overdriven options because they don't lend themselves to this.