For intonation practice, I used Finale NotePad to make myself some recordings of a "cello" playing each of the 12 sounding Major scales in arco from the bottom of my instrument (E1) to the top (F4) and back down. Being electronically produced, the intonation is spot-on (I used a 440 Hz A), and I also checked them with a Laidman & Katsura Lab Meter. I picked a "cello" so it would be playing an octave higher as I play along with it, so the recordings themselves are actually E2 to F5. I have these files in both .midi and .mov versions. Eventually, I intend to make these in the various minor scales, dominant, diminished, half-diminished, etc. The sound quality is excellent on both the .midi and .mov versions. It really does sound like an excellently-played cello. I can use the .mov version with Audiolab for my Mac so I can speed them up or slow them down without changing key. QuickTime plays them both, and iTunes plays the .mov versions excellently, but neither of those two programs can alter the speed. If anyone else is interested in these recordings, I could extend these scales by two semi-tones to cover G4 on a double bass. Then I should be able to email them to you, if you want. I made these things because as a beginner when practicing scales on a fretless instrument I don't want to train my ear wrong if, for instance, I have a tendency to sharpen the 4th or flatten the 7th, or whatever. Of course, maybe some of you think this project is a bad idea, so . . . comments? . . . suggestions? . . . any interest?