DetailsFrom gentle tremolo to roaring jet engine flange, the HT-MODULATION brings you all the musicality of the classic vintage effects pedals. For ease of use the Slow/Fast feature lets you adjust the modulation time of the eight different modulation effects while you are playing. The unique Saturation control then lets you add real valve compression and harmonics. Check out Blackstars own website for more details. Or better still come on in and give one a try!