
Take yourself down to the local guitar shop, peer into the pedal cabinet, and you will find all kinds of amp-in-a-box drives and preamps.
There will be overdrive pedals promising Marshall tone in a compact housing. There will be those offering Vox ACO chime, the tubular spank of a vintage Fender amp from the '60s. Many of them do the job superlatively, and can be used as a boost, overdrive, or as a powerful tone-shaper.