GarageBand User Guide
- Welcome
-
- Play a lesson
- Choose the input source for your guitar
- Customise the lesson window
- See how well you played a lesson
- Measure your progress over time
- Slow down a lesson
- Change the mix of a lesson
- View full-page music notation
- View glossary topics
- Practise guitar chords
- Tune your guitar in a lesson
- Open lessons in the GarageBand window
- Get additional Learn to Play lessons
- If your lesson doesn’t finish downloading
- Touch Bar shortcuts
- Glossary
![](https://help.apple.com/assets/5DB9EE1B094622A27C6D0647/5DB9EED7094622A37C6D0A8D/en_GB/8326ebf9ac4b7010ffff4334ce27feb5.png)
Use the amp controls in GarageBand on Mac
The amp settings include controls for the input gain, presence and master output. The Gain knob is located to the left in the knobs section, the Presence and Master knobs are to the right, and the Output slider is at the lower-right edge of the window.
![Amp Designer showing amp controls.](https://help.apple.com/assets/5DB9EE1B094622A27C6D0647/5DB9EED7094622A37C6D0A8D/en_GB/b91225b626fa99afc1b44a61d8f77f75.png)
Adjust the amp controls
Gain knob: Set the amount of pre-amplification applied to the input signal. This control affects specific amp models in different ways. For example, when you use the British Amp, the maximum gain setting produces a powerful crunch sound. When you use the Vintage British Head or Modern British Head, the same gain setting produces heavy distortion, suitable for lead solos.
Presence knob: Adjust the ultra-high frequency range — above the range of the Treble control. The Presence knob affects only the output (Master) stage.
Master knob: Set the output volume of the amplifier signal sent to the cabinet. For tube amplifiers, increasing the Master level typically produces a compressed and saturated sound, resulting in a more distorted and louder signal.
WARNING: Because high Master knob settings can produce an extremely loud output that can damage your speakers or hearing, start with a low Master knob setting and then slowly increase it.
Output slider or field: Set the final output level of Amp Designer.
Note: In the small interface, the slider is replaced with a field.