I understand Tampura app (I use Tampura droid) must be on during Bansuri practice so player learns to tell (by ear) whether they are in tune.
Since I have A-Scale Bansuri the Tampura is on A-Scale and note PA (from Sa RecGa Ma PA DHA NI SA)
But what 'speed' to keep it. By default the slider is in the middle. When do I speed up the Tampura? When do I slow down the Tampura?