The knobs can be fragile and may break off the circuit board if turned with excessive force.

The back panel is often just cardboard, which some users find suboptimal, leading to durability concerns over time.

Includes two LFO wave shapes, pitch envelope, LFO rate and depth, cutoff, and resonance, with button triggers for filter and LFO depth sweeps.

The EXT. SOURCE input may require a voltage controller to function properly, as direct input often yields no response.

The SX-150's stylus and pad input limits its usability; users find it more effective as a noise maker without external control.

The instrument lacks a MIDI input, making traditional external control challenging without modifications.

Compared to the Monotron, the SX-150 Mark II offers more features and greater modding potential for a similar price.

Similar to the Monotron, the SX-150's pitch control is described as finicky but not impossible, offering unique sound possibilities.

It excels in providing unique sounds for experimentation, but may not serve as the primary lead or bass instrument in every track.

The synthesizer is ideal for creating soundscapes with intertwining harmonics, especially when run through delay effects.

Owners have modded the SX-150 Mark II with a MIDI control kit from beatnic.jp, though tuning accuracy beyond an octave can be an issue.

One user attempted to control the SX-150 externally by connecting the stylus to various CV outputs, but encountered issues without a trigger or gate signal.

Users recommend considering a MIDI to CV converter for better external control, as direct CV inputs from other synths may not function effectively.

Playing the SX-150 is likened to a theremin in terms of skill required, due to the difficulty of keeping the stylus on the ribbon track.

The Behringer CAT's MIDI to CV capability was tested but failed to trigger the SX-150, suggesting potential compatibility issues.