70.3 bpm. Otherwise you can’t make music with OT. 
@Bryan_T made a list…
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I found it too, very intersting. I love Octatracking!
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I have a spreadsheet! It all has to do with the recording buffer and wanting to avoid gaps/clicks at the loop point. I had a long thread where I worked through the math and learned a lot about how the OT works.
That said, my general take on the OT is that it sequences really well. The recording buffers are somewhat compromised due to that. I truly hope that the LFOs aren’t compromised.
octatrack_clickless.numbers (1023.7 KB)
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The number of projects that I start at 65.6 bpm is kind of embarrassing.
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Almost diabolical !
I am probably too lazy, sometimes I start at 120 bpm, it is our French national anthem tempo ! 
No patriotic reasons though…
On Tempera, 88 bpm to match max rec length, 11s !
The devil’s slightly slower brother.
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I also have a bunch at 275.6, but those are for sound design purposes. What a fun box.
I do wonder how the LFO Designer will behave at 275.6.
I guess well. Lfo designer allows to multiply a triangle lfo speed by 8 btw.
My doubts are about Lfo Designer with Sync Trig, at pattern’s beginning.
Is the issue literally only on the first trig, but only on the 1st, 3rd, 5th, … times the pattern plays?
Not only on first trig, and I am not sure about working cycles.
Microtiming and speed 33 vs 32 solves it (on 16 steps, not sure with 64 steps)
Apparently solved using speed 4 mult x32 vs speed 32 mult x4.
Don’t ask me why ! Maybe speed isn’t precise in that case.
I compared square and designer on VOL using Sync Trig and same sample with phase opposition : perfectly null.
Differences using slices as dest…
Flex of course.
That’s wild!
8x16? 16x8? 2x64? 64x2?
Not perfect. Better with 2x64 but perfect with 4x32.
Interesting!
I’m back home with my OT and confirm that I get the same type of behavior with combinations of Mult/Spd. Quirky.
I’m playing at BPM = 153.1. Sixteen slices on sixteen trigs. I’m showing things as (Multiplier, speed).
Work:
4x, 32
16x, 8
64x, 2
Don’t work:
2x, 64
8x, 16
32x, 4
How’s that for inconsistent?!?!?
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At least there are working settings !
And the weird thing is that step lfo seems to behave normally with other destinations.
Would be interesting to compare with START mode (vs SLICE mode)
Forgot to mention that i was using the 2*Slice-1 mapping for the LFO values.
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Here’s a simple example. I cut the Moog (nearly) scalar thing into 16 slices on two separate tracks. LFO at 8x and 16.
Since I can’t help myself, I mapped the crossfader to speed with two different speeds as the B value, plus some filter, and reverb mix. A quick way to take something monotonous and transform it.
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With lfo designer I like to modulate speed with % trig conditions (fast odd speeds for randomness in Hold mode) and assign Speed 0 to a scene in order to freeze the value…
(ex with comb filter)
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I played around with the Amen file you posted. Unfortunately, it made me realize that the mult/speed settings that I thought were working do not always work. This was at 137.0 BPM.
Bummer.