#1
On my Blackstar HT20 I've got a ISF knob and I've never bothered to use it, always keeping it on 12:00


Can someone tell me what it does?
GIMME FUE GIMMA FAI GIMMA DABAJAZA


Fender American Strat > Korg Chromatic Tuner > Jemini Distortion > Boss DD7 > Blackstar HT 20
#2
Turning it back towards 7 gives a more 'american' tone turning towards 5 gives you British tone. Try it out

lan3y
Epiphone Les Paul Standard Limited Edition Worn cherry

Peavey Vypyr 30
#3
What does it actually do to your EQ though?
GIMME FUE GIMMA FAI GIMMA DABAJAZA


Fender American Strat > Korg Chromatic Tuner > Jemini Distortion > Boss DD7 > Blackstar HT 20