Welcome!
Aren’t we all haha.
You’ve written you wanted to complete your setup so what is your actual setup? The answer might change accordingly.
Each boxes do different things so to be sure:
Octatrack
sampler/sampling/fx/mix box/MIDI
You can play stereo & very long samples (like hours long), one shot samples, live sample up to 4 inputs (2 stereo machines?) and use the sequencer to mangle them, add fx, use it to play the recorded loop while transitioning to something else…
It has also MIDI tracks to control external gear.
it has the most feature rich Song mode.
It is very powerful but with great power comes… complexity. It can be used at a very basic level to begin with (playing one shot samples a la Digitakt) and then you can go deeper.
Analog Rytm
analog drum machine and one shot sample player
The analog engine uses “machines” which are synth engine dedicated to a certain type of sound (kick,snare, clap…) and you can layer one shot samples too. You can also sample.
It can send MIDI notes info (but nothing more)
and it has Song Mode too.
Very performative with the pads.
Syntakt
It has analog engines from the above Analog Rytm (the best ones in fact) and digital machines from the M:C and some new ones to create drums, virtual analog, chords, etc.
It has 12 tracks and you can use each track as a MIDI track to control external gear (more powerful than the AR).
The master effect and the sound is dope imho.
You can literally produce entire tracks with this box alone.
No song mode.
So the main question is: Do you need samples and is song mode important?
If you don’t need samples and are fine with no song mode, I’ll go Syntakt. This is the best machine to start your journey into the Elektron world.
If you need samples… The OT but as I said it’s not an easy box to begin with.
The AR, I’d say… get it if you want a mix of sampling and Analog engine