I use an Octatrack with the Pyramid, the Pyramid controls the OT, selecting OT Patterns and Mastering MIDI Clock.
I don’t use an option to mute OT tracks from the Pyramid, but it is a function of sending MIDI data to the OT.
1 - I can play individual samples on the OT from MIDI msgs from the Pyramid, but that’s just not a thing I do because the OT Audio sequencer + Trigs are extremely sexy. I have my OT Audio tracks/patterns triggered from the Pyramid. Also there is a thing on the OT if you want to trigger sample slices on one Track there is an annoying delay (60ms I think…doing that from memory…might be 30ms…I dont’ remember - it was an issue when I was programming a pad controller for playing slices on the OT). You have 8 Audio Tracks on the OT which can do different stuff on how you set it up (FLEX (loads sample into RAM), STATIC (plays samples from data card), THRU (processes incoming data per FX settings which can be sequenced parameters, modulated in realtime via the box or via MIDI, etc), NEIGHBOR (adds another layer of processing for an existing track), PICKUP (for recording audio data into the buffer for realtime looping, sample recording, lots of stuff I don’t currently use, etc)). If you want immediate sample playing for one shots, OT might not be the best solution, but you could do it forced to stick to 8 sounds/loops and not have the options to process incoming audio in realtime or use the Master Track settings.
2 - Mute/Unmute: Sure, probably. OT has some pretty robust if not quirky MIDI Implementation.
3 - Load/Unload samples via computer: Yeah, the OT you can just connect via USB, click an OT setting, and copy the files over. It’s extremely siimple.
Note: In my process, and I would infer the process for many OT users, I use a sample chain…that is up to 64 individual samples in one .WAV file which is then sliced on the OT and each slice can be triggered individually from one Audio Track. Also if you use any loops (I tend to create some on a DAW, then bounce them over to the OT) you can also embed a trigger for the loops in the patterns, and/or slice the loops to do some really tweaky stuff.
The OT is much more than just a single sample player and its power is in trigs, trig conditions, parameter locks, and creating basically a ‘sequence’ of effects parameters, modulations, and sample triggers, both cyclical modulations from LFOs and sequence oriented trigs (ie “at this beat right here, make the reverb really big just for that beat” or “at this beat, play this slice, and over here, play that slice” etc). Caveat: However, triggering an OT pattern from the Pyramid isn’t immediate as the OT is slave to the almight PLEN or Pattern Length - Triggering a pattern on the OT requires it to ‘play out’ to a predetermined length before starting the new pattern. There is a simple workaround for this that I use on my system, but requires a MIDI data translator such as a BomeBox or a MIDI Solutions Event Processor. (Sidenote: when I send a PgmChg msg from the Pyramid to the OT to select an OT Pattern, I stick a [Sequencer Stop] just before it and a [Sequencer Start] right after it…so i dont’ have to go back and forth with pattern lengths running out before a Pattern Change while I’m working on a section of a song)
The OT is a beast and an extremely intense learning curve if you’re not familiar with Elektron devices. That being said, it is extremely powerful in its sample handling for realtime modulations and patterning modulations via Trigs, etc. IMO they both work together beautifully, and it gets easier if you can run a translator between the two.
In my rig, I have 2 OT Tracks set to THRU machines processing incoming synth data, 5 Audio Tracks (sample chains & loops; FLEX and STATIC machines), and I use the Master Track feature that dedicates OT Audio Track 8 to a Master Effects Channel.
Caveat: I dont’ use a Digitakt, but I may add one if they get the OS stable and offer either Overbridge or a decent way to transfer/backup samples. (Been out of the loop on that device for awhile, so a recent update may have made things a bit easier) Also: I don’t get as heavy into the OT as most people, as I use it to enhance live synth played via MIDI or realtime and/or use audio loops because they have a different flexibility compared to synths. Plus I tend to simplify things to something I can wrap my head around so my creative process isn’t bound by learning every possible thing I can do with my tools. LOL