The SX-150 contains analog components as described in the following picture.
| The Controller | F | - A touch pen generates CV and Gate. - Also has a tiny extenal input that does F/V conversion. (but also responds to amplitude :-). |
| VCO | F | Has saw-tooth output |
| VCF | F | Sullen-Key type 12dB/Oct filter. Very much like Korg MS-20 filter. |
| Envelope Generator | F | AD type. |
| LFO | F | Two output waveforms: triangular and rectangular. |
| Output | F | Has an amplifier and speaker in it. Also has line output. |