Housed in an impressively tough stainless steel chassis, the Koch Pedaltone uses four twin‑triode valves, one of which is in the output stage, enabling power amp saturation to be replicated. A speaker simulator is included for recording or DI'ing.

Eight jack sockets on the rear of the unit provide enough flexibility for most live and studio requirements, though power comes from a consumer‑style external adaptor. Latching footswitches cater for performance control, while 11 knobs set up the sound for each of the two channels and for the power amp drive simulation. A rear‑panel Channel 1 Enhance switch allows you to introduce a subtle tonal change, adding a little more top and making the mids sound slightly scooped, for that 'more Stratty than Strat' rhythm sound.

The overdrive characteristics and playing dynamics of the Pedaltone are, unsurprisingly, very similar to those of a tube amp, and clean sounds with just enough drive to add a hint of jangle are nicely authentic. For recording, I feel the overdrive sound is somewhat let down by the speaker simulator — the mid‑range is pretty authentic, but there's no real bottom‑end kick even with bass EQ boost, and the high end has a somewhat fizzy edge which might (generously) be interpreted as sounding slightly American. Played through a guitar amp, however, even at very low levels, these problems are swept aside and the results can be extremely good.