The VM is really great sounding amp, probably one of the best Marshall has produced in years. It does clean up well when you roll down your guitar's volume control even in HDR mode. It's the most dynamic amp I've ever owned and is incredibly reactive to your guitar's controls. Here's a little clip of mine to help show you what I mean. I'm Using an Ibanez RG520QSB. I start with the neck position pick up in a split coil setting then switch to the bridge and roll the volume up. This is a lead tone clip. It al;most sounds like I'm stepping on a pedals but it's just the 5-way switch on a stock guitar.
As far as gain goes it's got gain o'plenty straight in with no pedals.
gothcha. I am pretty familiar with my guitar controlls. I almost never run the guitar dimed.
As far as volume level goes between LDR and HDR, you are correct, it's a substantial change. HDR mode adds an additional 12AX7 gain stage so it's a big jump. You need to keep in mind the Vintage Modern is a single channel amp. It's basically a hot rodded JTM45. LDR is more of a vintage tone and HDR is heavier like a modded amp. If you are used to a channel switcher this may not be for you. You need to be comfortable with using your guitar's controls with this amp. It's an old school vibe. You can get a lead boost by using a voume cut approach. The best way is to run the amp with an attenuator that has a foot switchable bypass. You run the rhythm with slight attenuation then stomp on the bypass for a lead boost. It works perfectly. The thing that throws most people when trying one are the Detail and Body gain controls. The best approach with them is to think of them as the low and high volume controls on a jumpered 4-holer. As long as you keep your Detail setting 2 or 3 clicks higher than your Body setting you will be happy.