Monotribe just sounds really good, but it had only an 8 step sequencer (an update expanded that to 16 steps), that ribbon keyboard ain’t fun either.
No envelope controls, just a three way switch to choose from env with attack, env with decay and env with sustain.
Also the Monotribe produces an audible clicking sound (due to amp env cutting audio), which can be modded, though.
IIRC when Korg released the update that allows to sequence the Monotribe from CV/Gate (needs a special cable, because the sync input is used for CV/Gate) it was already discontinued.
The Monotribe has some nice analog drum sounds, but without modding, there’s no control over the drums.
What is actually really cool, if you program a sequence into its sequencer, you can advance through the sequence with a trigger signal into the sync in (sample the Monotribes trigger out and you can use that in your sampler or daw).
Everytime it receives a trigger, it will play the next step. Send in straight 1/16th and you got the original sequence, send in straight 1/8th and the sequence plays half time, shuffle around the trigger notes to transform the sequence into something entirely different or add swing etc.
My fav non 303 for 303 type sounds are Shruthi with SMR4mk2 filter, Monotribe, Octatrack filter with single cycle wavs and Analog Keys.