This was apparently the second most popular pedal in the Soundtank (aka 'Potato Bug') series, after the TS5 Tube Screamer. If you are unfamiliar with the 5 series, they were a budget follow-up to the 8, 9 and 10 series, with a plastic shell on a metal baseplate. More info can be found [url="http://www.effectsdatabase.com/model/ibanez/soundtank/pl5#"]here[/url].
It's a distortion/overdrive pedal. I found it excessively vicious so I replaced the clipping diodes with nearly-matched LEDs, which allows a much more usable range of distortion. I also seem to recall replacing the 9V power inlet socket, as the original was knackered. The tone control is not simply a treble roll-off filter, it sweeps the mid band form piercing to fat. The overall sound is quite mid-centred, not really suitable for bass unless you are running a two-amp setup.
The pedal is in fair condition, although the level pot crackles if you wiggle it. I am asking a paltry [size=5][b]£15[/b][/size] delivered in the UK.