Thanks. I'm just a bit surprised that's there no information about it either on their website, the description of the instrument and the lack of it in their reply to my query. No doubt it'll all come clear in the end.

I've just recieved my Wessex 4 valve baritone and noticed that it comes with an extra, slightly larger 4th valve tuning slide. They say it's to improve intonation in some registers - has anyone got one of these and found it useful and, if so, what registers does it improve? So far, it seems to play ...