Mystery Electronic Drum Pad Setting

Ancien

I have a Thomann MPS 200 Electronic drum kit and have found a voice setting that is not documented in the manual. I have contacted Thomann but they wanted to know my Customer Number. I bought the kit a few years (Thomann no longer make this model) from The Rock Project, a UK Rock Instument tutor franchise. I gave Thomann the Rock Project Customer number and was told that Thomann can only deal with them. Not a good way of gaining good references. Also not a recommendation for buying secondhand Thomann kit.
Anyway the setting has a range of 1 to 99 and is prefixed by this character П (for example П053)
(It may not show correctly on this forum but should look like and upside down capital U but with a flat top not a curve). It would appear to change the pitch slightly (there is already a pitch setting) but even if the customized kit is saved using this setting the pitch from this setting has changed when the kit is turned on at another time.
Can anyone help please.