| 26882 | Frequency Analyser | ZX-Spectrum 48K | English |
| 8185 | Frequenz Analyse | ZX-Spectrum 48K | German |
| 13198 | Fuller Box & Orator Demonstration | ZX-Spectrum 48K | English |
| 8213 | Gossip | ZX-Spectrum 48K | German |
| 8237 | Header | ZX-Spectrum 48K | German |
| 28982 | High Resolution Sound Analysis | ZX81 16K | Dutch |
| 8262 | Hlasový program | ZX-Spectrum 48K | Czech |
| 17926 | Hooter | ZX-Spectrum 16K | English |
| 19252 | Interrupt Sound Effects | ZX-Spectrum 48K | English |
| 25149 | Kanal Mowy | ZX-Spectrum 48K | Polish |
| 38384 | Kecal | ZX-Spectrum 48K | Multi-language: Czech, English |
| 15650 | Kecal 2 | ZX-Spectrum 48K | Czech |
| 13384 | Key Speaker | ZX-Spectrum 16K | English |
| 29009 | Keyboard Sound | ZX81 1K | English |
| 27572 | Kmiocki Sampler-Digitiser | ZX-Spectrum 48K | Polish |
| 8321 | Kreds Alys | ZX-Spectrum 48K | English |
| 26494 | La Voce | ZX-Spectrum 48K | Italian |
| 39805 | Machine Code Sounds | ZX-Spectrum 48K | English |
| 43588 | Master Music | ZX-Spectrum 48K | English |
| 22658 | Mastersound FX | ZX-Spectrum 48K | English |