more doc updates

papers/doc/2-interface/asset-list.md

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+# instrument list
+
+image
+
+# wavetable list
+
+image
+
+# sample list
+
+image

papers/doc/2-interface/play-edit-controls.md

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+# play/edit controls
+
+image
+
+these are used to control playback and change parameters of the pattern view.
+
+TODO: explain
+
+## other layouts
+
+the layout can be changed in Settings > Appearance to one of these:
+
+### classic
+
+image
+
+### compact
+
+image
+
+### compact (vertical)
+
+image

papers/doc/2-interface/song-info.md

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+# song info
+
+# sub-songs
+
+# speed