Comping MIDI take lanes results in massive CWP file size and slow load/save times in Cakewalk Sonar

[Josh B.]

We used an Alesis Strata Prime as a MIDI controller and recorded five different takes on a Superior Drummer 3 virtual instrument track. MIDI notes, velocity, and CC for the hi-hat pedal were recorded for each take. All the drums/cymbals were mapped correctly to SD3 and sounded fine when we replayed the takes.

Before any segmenting or comping, with all take lanes in their original format, the CWP file size was 2,086 KB.  After I isolated different sections for auditioning and re-saved, the CWP file size ballooned to 102,459 KB.  Opening the file takes around 2 minutes, and saving takes about the same amount of time. 

I went back and bounced all the MIDI takes to remove any sections I created for auditioning, which reduced the file size to roughly 2,000 KB.

Does anybody know what's going on with the filesize after segmenting the MIDI take lanes? Is this even a viable workflow, or should comping take lanes be reserved for RAW audio?

I suspect it may have something to do with the MIDI CC. Years ago, I had issues working with MIDI CC when I recorded some modulation via an AKAI MPK mini. Anytime I tried to manipulate the MIDI CC, Cakewalk by Bandlab would hang and/or crash... not sure if this is similar to what's going on now with what I'm doing in Cakewalk Sonar, but I wanted to mention it.

BTW, I'm on a PC with 32 GB RAM and an AMD Ryzen AI processor with an Audiobox USB96 interface.

[Amberwolf]

If you are using non-destructive midi editing, then every clip you split / cut duplicates the *entire* clip, but exposes only the part of the clip between the cuts. 

So if you make a lot of cuts, you get a lot of copies of the full data of the original clip.

If you bounce all those clips (individually or together) you erase all the hidden data. 

If you never slip-edit stuff back into view, you could temporarily or permanently turn off NDME in your options, but doing this means that every slip-edit you do to a midi clip destroys the information you hide, not just hiding it.   

 

Audio clips are always nondestructive edits, so the same applies there.  

 

If you have a lot of clips with hidden data, you can make a project VERY slow to save.  Frequent autosave can be hell.