ALSA mixer controls the sound settings from a commandline utility. An alternative is RetroVol.

Alsamixer has 3 different views:

1. playback - these settings only affect how you HEAR sound (not how it is recorded)

2. capture - these settings only affect how sound is CAPTURED/RECORDED (not how it sounds when playing back)

3. all settings

AlsaMixer is built into any Puppy versions, go to-

PuppyMenu > Multimedia > AlsaMixer

ALSA - Advanced Linux Sound Architecture

ALSA homepage

ALSA settings forum post