Dissolving to lanes
In the lower right section of the Dissolve Part dialog, you will find the “Dissolve to Lanes” option. If this option is activated, the part will not be dissolved onto different tracks but onto different lanes of the original track, allowing for a better management of MIDI material that “belongs together”.
This is useful when working with drums for example, as it allows you to split up a part into different drum sounds and edit these independently. When you have made the desired modifications, you can reassemble all your drums into one part using the Bounce MIDI command, see below.
This option is especially handy when working with instrument parts on instrument tracks. “Normal” dissolving would lead to a number of different tracks each routed to a separate instance of the connected VST instrument. When dissolving parts to lanes, the parts will still reside on the same track, with all parts using the same VST instrument instance.