==== First , the Initial Setup ====

# '''When adding sound-fonts into Qsynth, write-down the SFID number ''' (i.e. Sound-font Identification number) - Do NOT close this dialog box quite yet!# Now, here's the trick: For each sound font, '''make certain that the "Offset" number corresponds to the same number as the SFID!'''# Now, '''click OK to save and exit ''' the sound-font dialog box.# If you are running Jack, then you need to '''restart the Jack engine'''. This will require that you manually connect the instruments in the "Jack Connections" dialog box. If this is "a pain", you could always quit all applications, and re-run your Bash shell script to launch your music session...# Go to the '''Channels dialog box, and double-click on a midi channel'''.# Select the Bank number (which corresponds to the Offset or SFID that you have written-down).#Then click on the program number to select an instrument (depending on the sound-font, there may be only one to select, or a wide variety if the sound-font is a bank of sounds).# NOTE: in order for the changes to take effect, you need to click the Save button; otherwise, all your changes will be lost!# You may need to restart the Jack engine and re-establish your connections. That is about it! My M-AUDIO keyboard allows me to easily change between midi channels by pressing the Advanced Functions button, and then pressing a note on the keyboard that corresponds to the midi channel. Easy-Breezy, and efficient! :) Here is a link to documentation of my M-AUDIO midi keyboard for reference: [ ] 

'''Note:''' The ''Swamy sound-font editor'' allows me to build or modify sound fonts. s I must admit that I'm not an expert on sound-fonts.