I use Boss EV-30 with Boss MS-3 as volume pedal and as a wah pedal. Works great and has a lots of options. In size vice very good. One possible (not 100% sure yet) downside is that, as a volume pedal use, there might be a certain spot where volume doesn't go up/down perfectly smooth, meaning there's is a "step". This might be also just an adjustment issue or using EV-30 at very low amp volume, not 100 % sure. Anyways, not a deal breaker. In general I'm very pleased with pedal. Ordering and delivery was smooth and quick by Thomann!