[linux-audio-user] Midi tuning control?

Setup: older roland kbcontroller mkb-200 and SBlive w/soundfont; works great for weekly practice group session, my solo practice, ..., and I'm enjoying it and linux audio. But sometimes I need a pitch (tuning) slider; some way to easily "tune" the keyboard to an out-of-tune recording, piano, etc. (Years ago, I used win31/sb&roland-daughter-card and there was an effects program that could tune. But it required use of computer kb and mouse so it wasn't what I'd call easy.) Right now when this need happens, I just quit playing kb and pick up my sax :>) I've never created a useful midi recording; I use it just for a keyboard to play. (Recently bought the book for Rosegarden and one these days, I hope ..) So I don't know much about midi ways of controlling stuff. The mkb-200 has 2 sliders for volume (lower and upper kb split), modulation (depth & risetime) sliders, pitch-bend wheel which is also modulation on, and buttons for stuff like channel, voice, after-touch, ... I have now idea how any of these might be used, or if some other midi device that I could buy, might give me a tuning slider. Is midi pitch tuning a part of any linux program like rosegarden, or a synth program or ??? If so, do any not require computer kb and mouse? Is there a command line way to do it? I've done a bit of googling on this without joy so far. Am I missing something obvious, or am I the only one that runs into the need to tune to someones out-of-tune instrument? Marv