watara instr docs

doc/4-instrument/watarasv.md

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+# Watara Supervision instrument editor
+
+the atara Supervision instrument editor consists of two tabs: one controlling sample channel assignments and macro tab containing several macros.
+
+## Sample
+
+for sample settings, see the the Sample instrument editor](sample.md).
+
+the only differences are the lack of an "Use wavetable" option, and the presence of a "Use sample" one.
+
+## Macros
+
+- **Volume**: volume sequence.
+- **Arpeggio**: pitch sequence.
+- **Duty/Noise**: pulse wave duty cycle or noise mode sequence.
+- **Noise/PCM Pan**: output for left and right channels for noise and PCM channels.
+- **Pitch**: fine pitch.