Droning options

[amerotz]

Implement different models (e.g. violin, free drone, pipes, bourdon)

[amerotz]

"drone": { "strings": { "notes": [55, 62, 69, 76], "break_ornaments": false, "threshold": 0.5, "bind": "drone", "velocity_multiplier": 0.9 }, "open": { "notes": [55, 62, 69, 76], "threshold": 0.5, "bind": "drone", "velocity_multiplier": 0.9 }, "bourdon": { "notes": [], "threshold": 0.5, "bind": "drone", "velocity_multiplier": 0.9 } },