I play in an oasis cover group and im trying to nail down noel gallaghers jcm900 dual reverb settings. This is difficult as live he almost always played through more than one amp...i did find a youtube clip (sorry i dont know how to attach a link) where he just used the jcm900. Its "oasis mtv 1994" and its 12 mins long. To me that sounds like alot of gain. To back that up in the youtube clip of their knebworth gig in 1996 the camera sweeps past his amp and seems to show the clean channel at full gain and lead channel at 3/4 gain. There are people who say however that they used very little gain and lots of volume.
If anyone wants to help out that would be great. Please, no point saying oasis is rubbish or that tone sucks etc. It may not be the best tone ever but its a good teference point for me with my jcm900.