Hi,
Judging from your post, I surmise your band have not being jamming together for long. I have some advise which could help.
A lot of bands when starting out (esp teenage), don't understand the meaning of power. Their idea is just "you play loud, I'll just play louder".
In a jamming studio, most of the time, because everyone wants good powerfull amp. Almost all studios will have amps that is TOO powerfull for the jam room, when you crank it up.
Even my own studio, I'm using Peavey Bandit 1X12 80watts, although not that big (like 2X12 or 4X12). It's still too powerfull when you crank it high. My amp has being used for performance, it's loud enough not to require mike up. (Just used it yesterday, can fill an entire bus interchange)
So, NEVER operate the studio amps at max. The small room can only accomodate SO much noise. One rule of thumb, if you can hear your own playing, it's loud enough. Educate the rest of your band members, also your drummer. You play louder, he wack harder.
The result, you don't practise, you just there to satisfy your own ego. Worst, you break the studio equipment and drum and you have to pay for it.
Yeah, feedback that you don't know how to control, means you have not learn much about playing lead at all. Learn to work your guitar volume, the gain on effect and volume on amp. All these correspond to the sound you desire. If you don't understand how they work, then you cannot play LEAD properly. Find someone to teach you, or go for lessons, or read more books on this.
regards,
Mike
Mikemann Music Studio
www.geocities.com/mikemann88