How to turn off recording reverb in GarageBand:

1. Open GarageBand and click the "gear" icon in the upper right corner.

2. After entering the settings page, click "Track Control".

3. Pull down the interface on the left, find "Main Effect" and click it.

4. Find "Reverb" in "Main Effects" and click the switch to the right of it.

5. After turning off the "Reverb" switch, the reverberation effect in the music will be turned off.

After the above steps are completed, the recording reverberation is successfully turned off. If you need to turn on recording reverb again, just turn the "Reverb" switch back on.