AMP - general amplifier family:
- Tweed - classic American clean-sound amps.
- British - crunch and moderate gain.
- California - modern hi-gain amp with a deep low-end.
- Hot wired (same as hi-gain but with a high-freq boost).
- Classic - far from the speaker.
- Center - the most bright setting.
- Off-axis - slightly offset microphone that provides smoothed high-freq response.