Boss HM-2? I use the new TC Eyemaster straight into the FX return of an Orange Dark Terror or an EHX 22 Caliber and sounds gorgeous. Alternatively, Blackstar HT pedals works well as preamps. I tried the HT Dual and the Dist X, both works great. The Dual, as far as I understand, is basically the preamp of the HT-5 in a pedal.