I found out that if i turn on my Wah pedal with Blackstar HT-5 it gives it an extra boost, especially good for heavy riffing. i boosted it with Boss SD-1 and the sound was definately not in the territory of good high gain, but when i turned on a Wah pedal and just leave it on full without touching it, it gave to an amp a whole new level of chunk and bass response, the amp then just sounded killer for heavy rhythm stuff. the Wah pedal is a classic, the cheapest one from Dunlop.