My understanding is the following.
Samples can be stored on the device organized in sub-folders under the dedicated folder.
The device also supports presets which can use samples (for sampler, drum, multisampler engines currently). These user created presets are compact in regards that the referred samples are stored in the corresponding preset sub-folder (that’s great).
Projects consist of instruments that can be newly created stuffs or based on presets. I suspect the project files don’t directly refer to presets (those are just loaded into the project but from that point the instrument configurations are part of the project). However projects are not self-contained so the samples are just referred and not stored in dedicated project folder.
So samples can be referred from at least 3 places, I think, in a project:
- sample sub-folders
- preset folders
- sample folder (under user?) where the waveforms sampled directly into an instrument are stored
The readme says that if the user wants to move projects from one device to another all the corresponding samples must also be copied. This is the case when a user wants to backup projects or do some housekeeping on the device storage. The OP-XY has 8 GB storage which can be a limitation in long term (based on my calculations it can store ~1511 wav files when all of them are 20s long 44.1kHz/24bit waveforms) and if some sample packs are installed a limited space remains for sampling sounds into the device. However it is not to safe to clean up the storage as deleting samples from the device can break projects and it is unclear how to identify samples used by a given project.
I suspect a kind of collect feature or a tool that can backup a project along with all the referred samples could be very useful.