The configuration of the Orange Amps OR 120 is really easy to follow, as it does not have an exurbanite amount of parameters. It does have knobs for master, gain, presence, treble, bass, and FAC, from the right to left and definitely provides a good amount of control over your tone. Getting a good sound is extremely easy as the inherent tone is very rich and the overdrive is outstanding. I don't have a manual for the Orange Amps OR 120, but it is easy enough to use that you don't need it if you don't already have one.
The sounds that you can get from the Orange Amps OR 120 are really awesome. While it excels mostly for its overdrive tones, the clean tone is great as well. I have only used this amp with guitar, as that is what it is designed for - usually a Fender Strat or a Gibson SG, always with results I'm happy with. The overdrive tone is crunchy and quite full, while the clean sound is vibrant and nice sounding. This amp is perfect for rock music, especially for harder rock, but will work great for a variety of genres.
I've been using the Orange Amps OR 120 for about two years, and I have found it to be yet another great amplifier from Orange Amps. When it comes to built in overdrive, no one makes better amps than Orange, and the Orange Amps OR 120 is one of their best in terms of overdrive. This amp isn't cheap, but whether you are a professional or an amateur it is worth the price because you will be getting a high end guitar amp that you can use for years to come. All in all, I highly recommend the Orange Amps OR 120 to all guitar players.