gain means mic volume

Talking about the loudness of the sound coming out of the speakers that's technically "volume" and talking about the loudness of the sound going into the mic, that's "gain." If you want to change the way your voice sounds on the recording look for a way to adjust how loud your mic is. One thing you've got to realize with Manny is he's probably listening to your podcast with shitty headphones in the corner of the dayroom. Advice for those listening who aren't homeless, just play the podcast loudly on actual speakers. These podcasts are sort of like certain types of heavy metal music that MUST be listened to at max volume to sound good. Better to listen to it from across the room, or even down the hall, at max volume than to try to make out what is being said up close with volume low. At first the sound quality might be reminiscent of a boyhood string and tin can telephone. It's buzzy like that, but if you turn it up loud enough the buzzing just becomes part of a background roar and it's really quite easy to make the message out.