Settings
Touch the Settings button at the top of the main view. In the top left is a Share button, you can use it to make backups of the file omb.cfg. This file contains all the settings also for the voices and panel buttons with all their menus in the main view. After time there might be a lot off work in that so make a backup now and then. Press the home button and restart One Man Band before you share the file, to make sure that all the changes you made are saved in the file. When you copy the file back to OMB (iCloud, mail) all the settings will be restored.
Ports
In the MIDI In and MIDI Out list you will see the MIDI connections that are available. If you don't have any at the moment you can select the Soundfont player. When the soundfont player is selected you can select a soundfont with music instruments. The selection list will initially show no soundfonts but there is a Download Soundfont button, touch it and you will go to the Soundfont download page in Safari. Download a GM soundfont and select to copy it to One Man Band. You wil return to the Soundfont list that now lists the soundfont, select it. To use one of your own soundfont, copy it to One Man Band from iCloud.
If you are using a plain vanilla GM synthesizer then select GM for Compatibility mode. If it is a Yamama XG synthesizer then select XG. If the styles you are using are exactly made for the synthesizer you are using, then select Identical.
If your synthesizer has a GM bank that is not at bank 0 then specify the msb and lsb (banknumber = 128*msb + lsb).
Keyboard
The different chord recognitions are described here.
Highest chord key is the right most key of the chord area, B4 is just left of the middle C.
Keyboard split specifies an optional range of the keyboard for a second melody instrument. It uses the same instrument as the bass channel, which is defined in the voices. If none, there is no range of the keyboard assigned to this. If the value is lower than the highest chordkey then the split area is to the left of the chord area. If the value is higher than the highest chordkey then the split area is to the right of the melody area.
Fixation: Select the controller type (e.g. from a MIDI footswitch) that will switch the chord recognition on and off. With chordfixation on, the chord will not change nomatter what you play.
Chord channel: Should only be specified when using a MIDI accordion that sends chord notes and melody notes on different channels. Or when you use separate MIDI keyboard controllers for chords and melody. Select a specific channel to receive chords from. If specified then highest chord key is ignored, all notes from this channel are regarded as (left hand) chord notes and all notes from other channels are regarded as (right hand) melody notes. Default is All: notes on all channels up to the highest chord key are regarded as left hand notes and otherwise as right hand notes.
Bass channel: Note played on this (MIDI in) channel will be played with the instrument defined as bass/split instrument in the current voice.
Confirm restart: When chord recognition is "full keyboard" or "guitar" then a problem may occur when you keep playing melody after the ending. If a chord is recognized then the accompaniment will restart unwantedly. To prevent this check this option and the accompaniment will not restart after the ending until you have deblocked it with the confirm restart function (one of the functions assignable to keys or MIDI messages).
Touch sensitive variations: At each chord played a variation will be chosen depending on the velocity of the chordkeys. So play the chord very softy to switch to Main A and hit the chord hard to switch to Main D.
Triggers and Sliders
These are described here.
Sound
Controller defaults: If a style does not contain specific settings for a channel regarding volume, pan, reverb etc. then the values listed here will be used. These initial controllers will be send when a style is switched instead of a GM Reset which would cause a glitch when switching styles non-stop.
Style loudness correction: When collecting all kinds of styles from the internet you will notice that the loudness of each style may vary a lot. This is a problem when you are playing live and don't want to adjust volume each time you switch styles. Therefor this can be automated by selecting "Avarage" as correction method. If you play styles where there is also too much difference in loudness between the instruments in one style then you can choose "Fixed".
Harmony velocity: Specify how loud the added harmonies in the multivoices should be as percentage of the note-on velocity of the original melody notes that you played with your right hand.Files
Recorded MIDI files can be save as type 0 (with all channels in the same track) or type 1 (with a separate track for each channel).