I think you could have a pretty good effects loop put in, but for the cost to have it done right you might as well look into other amps.
Your DM-2 muds up before the amp? *Mine does ok, but I agree, much better after distortion. *The EH MM Deluxe does quite well before...I think it's about as close to a tape echo as you can get.
Is the JCM800 going to help you get OD at lower volumes than the JTM45...aren't they close in power rating? *It seems that there is a device that reduces your amp output to line levell so you can run into effects and then into a
power amp (not a variac, which reduces voltage, or power brake which I don't think take the level down that low). *But even then, you'd need a power amp. *Not sure what the best fix would be?
Greg