First, PianoBooster is a wonderful tool to practice and learn piano from MIDI files. Thanks.
Second, some notes in a musical score are placed in the other musical stave (pentagram). More precisely, high notes in the lower stave (left hand) are misplaced as low notes in the upper stave (right hand). See picture:
Then, when playing only one hand (right hand) with PianoBooster, also the other hand (left hand) is needed to go on playing. This is confusing to the player. Is there a way to move those misplaced notes to the correct stave? Please, answer to firstname.lastname@example.org Thanks.
Piano Booster already has separate left and right hand parts. If both parts are contained in a single MIDI channel in the MIDI file then P.B. tries to guess which is the left and right hand parts by assuming everything below middle C is for the left hand part and everything above is for the right hand. This is what you are seeing in your screenshot.
To separate out the two hands then the MIDI file needs to be edited so that the left hand piano part is on MIDI channel 3 and the right hand piano part is on MIDI channel 4.
I am replying to this now (very late sorry) so that the issue raised for this can be closed.
I am using Windows 10 and I have installed MuseScore but it seems too complicated for me. I just want to move few notes in some midi files from the upper staff to the lower staff (so I can play the left hand only or the righ hand only with Piano Booster). I will wait for a future version of Piano Booster where a user can easily reassign the channel of each note to 3 or 4 when the midi file brings all notes in channel 1. Many thanks once again for your useful and wonderful software. The issue can be closed now.
For windows you can use MidiEditor from https://midieditor.org/. It's free software but please donate if you find it useful.
Open the midi in the application then select the notes that you want to change chanel (multiple selections possible by pressing shift key) then from Tools-> Move events to channel - >select the chanel you want to change to. Then save the file and you are good to go...