See It: Watch the vibrations of your strings. The wider the vibrations, the more in tune you are (to your instrument).
Ringtones: Listen for the "ringtones." The clearer the ring, the more in tune you are. The open string notes (C, G, D, A) will ring more easily than others.
Beats: When two notes are nearly but not exactly in tune, you will hear beats, a phenomenon caused by sound wave interference. The faster the beats, the more out of tune the two pitches are; the slower the beats, the closer they are to being in tune. When the beats disappear, the two notes are in tune.
Vibrato: Do practice for perfect intonation, but in a pinch, vibrato covers a multitude of sins!
Saving: If you need to save your bow, move closer to the bridge with more weight.
Spending: If you need to spend your bow, move closer to the fingerboard with less weight.
Extra sounds? Sounds lower than the played pitch = too much weight. Sounds higher than the played pitch = not enough weight.
Fuzzy sound? On low strings, play nearer the finger board. On high strings, play nearer the bridge.
Scratchy? Make sure your stick/wood isn't scratching; this happens if your bow is tilting too far.
Feel it: Try this: play an open string. With your left hand, touch different parts of the instrument, e.g. scroll, upper bouts, lower bouts, tail piece, etc. Can you feel the vibrations in all those places? If not, you need to adjust your bow weight, speed, and placement.
Feel it Again: Try this: play a note with your left hand. Notice your jaw and collarbone where your instrument touches you, under your left finger through the strings, at the neck where your thumb touches, under your right fingers through the bow. Can you feel the vibrations in these places? If not, adjust your bow weight, speed, and placement.
Heavy bow at medium speed will make them pop (if your fingers are in the right place)
Perform ten (10) mock-performances before the actual performance. These should be in ten different locations for ten different audiences.
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