Out 1 Block: Balance ... for a row you never use (6?)
This was the perfect suggestion for the parameter to use with the batch modify feature to enable gapless switching on pre 6.00 presets. Used a 0.1 value in the 'Balance' parameter on the 6th row in the Output block as you recommended and saved all presets with the change. Then switched the value back to 0.0, saved all presets again, and did a full backup. Was able to execute this with pretty much 100% assurance that it didn't impact any of my presets other than to allow them to work with gapless switching. Thank you!