update TODO

TODO

@@ -1,10 +1,26 @@
 -figure out all magic commands
 -make complete gui
--amp/cabinet models
+-cabinet models
 -tone library
 -effects library
 -effects level
--handling presets (loading, saving, exporting/importing to/from xml patches)
+-handling presets (loading, saving, exporting to xml patches)
 -buildsystem
--figure out how to get current device settings, start gui with proper values
--fix expression pedal settings (possible types depend on active preset)
+-start gui with proper values
+   To do so we need to figure out reply formatting of command querying preset.
+   amidi --port=hw:1,0,0 --send-hex F0 00 00 10 00 5E 02 2a 00 04 00 62 F7 --receive=preset
+   will create file named preset (give a while for it, and then hit ctrl+c)
+   this file should have around 440 bytes (depends on actual preset)
+   0x21 byte holds amount of options
+   from 0x22 byte starts effects configuration which is:
+     -2 bytes for ID
+     -1 byte for position
+     -1 to 3 bytes for value
+   Each 8th byte (beginning from 0x27) seems to be status byte which describes
+   whether or not we shall add 0x80 to ID or value and whether or not value
+   will be multibyte. So far I couldn't figure the exact meaning of those bytes.
+   To check you can download some patch from DigiTech Sound Community, apply
+   it to your device, and then do this amidi command.
+   Open resulting file in hex editor, and open patch file in text editor.
+   Every ID, position and value found in patch will appear in the binary file.
+-fix expression pedal settings (possible types depend on active effects)