One sketch: make the FM part itself
Choose the volca fm2 direction when the desired part is a six-voice FM instrument. KORG specifies six operators and a sixteen-step sequencer. That is a clear reason to investigate it for a small hardware music setup: the sound-generating approach and multiple voices are the point, not merely the compact shape.
Its MIDI velocity support is another stated feature, but should not be read as a promise that the internal touch keys sense playing force. The distinction matters if the way you intend to play is part of the purchase decision.
Another sketch: an instrument that also receives sound
NTS-1 digital kit mkII gives a different starting point. It is a DIY-format synth kit with an eight-step sequencer, and its audio input lets its effects become relevant to another sound source. Someone who wants a small object to occupy more than one place in the sound chain has a reason to look here.
The specifications describe its oscillator and filter alongside the input/output path. They do not make it a substitute for the volca’s six-voice FM architecture. Nor should its current logueSDK generation be treated as a promise that every first-generation extension will transfer unchanged.
Count the job before counting steps
Sixteen versus eight sequencer steps is a real distinction, but it is secondary if the two devices would do different jobs. A buyer who wants to create an FM part may care more about the volca’s voices and operators; a buyer wanting an additional synth-and-effects role may care more about the NTS-1’s audio input.
Draw that intended job into the setup before choosing. The volca makes the stronger case when FM voice-making is the attraction. The NTS-1 mkII makes the stronger case when its kit format and sound-input role are useful. “Small KORG device” alone is not enough of a reason to expect either one to replace the other.
Sources & further reading
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