Hughes & Kettner Preamp/Recording Amp - Manual (Page 8)

BATT SUGGESTED CONFIGURATION
The sounds suggested here can only be rough indication, as they will vary
considerably depending on the instrument used and your playing technique. Once
you have set-up a basic sound which you like, the boost functions and the pre/post
power amp switch provide instant access to different sounds.
1.
“STRAIGHT ROCK”:
For raw valve sounds, turn gain little over half way. MID BOOST is activated,
LINE PRE/POST switched to POST power amp.
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T R E B L E
2. “SLAP ATTACK”: .
Set GAIN between 4 and 5, emphasize the bass region with the tone control ,
activate BASS and TREBLE BOOST and set the switch to POST POWER AMP.