I use a version of puppy - not Xenial.
In the terminal if you type "alsamixer" without the quotes you should get a window - in my case I get 8 "sliders" showing. I do not have a USB mic so not sure how your sliders will be labelled.
Cursor across to something that looks likely. What each slider does shows on the left hand top corner.
At the bottom of the slider you will most likely have what looks like MM.
Press m on the keyboard and the MM should change to OO.
Use the + / - keys to adjust volume.
If you picked the wrong slider simply press m again to cancel the slider.
There are also F keys on the top right corner - F6 may be helpful.
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