Re: [linux-audio-dev] Tuning

Back in the days before I converted my windows partition to ext3, I used Cubase with a number of VST instruments and effects. I miss a number of these, but there is usually something equivalent or something that will one day be equivalent in the Linux world. One thing I haven't been able to replace so far is the Oberheim OB-Tune plug-in. This was an amazingly useful plug-in that would take an audio input and make sure it stayed in tune. It worked on guitars, vocals, synths, whatever. There were a number of ways to use it. You could define a set of notes that were allowed, and audio would be made to be in tune with the closest note (useful for phrases) or you could specify a single note. This was all parameterised, so you could write changes to these throughout a track. Is there anything like this out there at the moment for Linux? If there isn't, does anyone have any idea how it works? I might consider implementing something similar, but I'm not sure where to begin. Here's what I'm thinking: Operate in smallish chunks. Find the most intense frequency (FFT or such) and decide how far that is from the desired frequency. Scale accordingly, preferably with as little distortion as possible, so pack and crossfade sections. If anyone has any thoughts, please let me know. I'd expect to make this a plug-in rather than a standalone app, but I've never touched LADSPA before - is it possible to send events to change parameters? This might be more than I can chew, but I intend to bite anyway. James