Is it possible to use a standard 440 Hz digital tuner to emulate a 415 Hz tuner, even if it doesn't explicitly support setting the A4 frequency?
I'm learning to play the viol, and I can't find a good 415 tuner and I'm not skilled enough to tune by ear. I've tried a dozen digital tuning apps for Android, but most don't support setting A4, and the few that do still don't seem to work well for the viol's range.
However, doesn't 415 Hz exactly correspond to a step down in the 440 scale? If a string is, say, D2 at 440, would the effective 415 Hz note be C# at 440? So if I just target a step down for all my notes with my regular tuner, would that work without needing a 415 tuner?