Well I succumbed to Cyber Monday and just ordered a 'Mint' BOSS LS-2 Line Switcher off Reverb! £57! The pedalboard is nearing the core 5 pedals I think I need for a basic rig. The LS-2 will switch between a BD-2 and the DSL preamp in loop A, and an MT-2 in loop B going directly into the DSL return (bypassing the preamp). Next I need to find a BOSS RV-6 and we're off! Though this might be close enough to start thinking about getting a RockBoard Tres 3.1 and start plumbing it all in!