None of the classic DOS trackers or any of their early Windows brethren will do any left-to-right scrolling.
This makes me oldschool, but there was a DOS tracker that went in piano-roll style. Modedit one of the last versions, did this, and I've been waiting/hoping for a GUI tracker that has anywhere near the simple style of this. (of course i was also waiting for a tracker that has an onboard sampler/sampleditor A la FT2, thank you milkytracker!) if only a decent tracker with a nice gui (read: NOT Impulse-esque) would come out and also have a piano-roll style editing function (and of course onboard sample tweaking/editing) I would be in heaven. I'm lately trying to find Linux equivalents of various software that I love on Wintel, if only an app with the user friendliness of OMPT would come out, (HINT HINT any devs of OMPT!) Anyone have anything close? I'm using Milky right now. I love that they have a WM version too

the only tracker I know of for windows CE/mobile.