After having installed init sound on tracks pressing the trigger keys multiple times results in different sound similar but different ex Amp Env one sound with Long Attack (my setting) and other sound with very Short Attack.
I read on some post about Multimap but cant find how to access it neither understand.
When USE TRK SOUNDS is active each voice is bound to the sound of its corresponding track (voice 1 is bound to the sound of track 1 etc.pp.).
To visualize what is happening think of a single track (let’s say track 1) configured to use up to 4 voices and you trigger a 4-note chord. What you will hear then is not the sound of track 1 with 4 different pitches, but the sounds of track 1, track 2, track 3 and track 4.
In your case I’ll guess that just the AMP settings of the different tracks were different. So while the sounds of the tracks sounded similar due to USE TRK SOUNDS different AMP settings were used for each new note depending which voice got allocated to play the sound.