| Field | Computing |
| Went Obsolete | 1990s |
| Made Obsolete By | Floppy Disk technology |
| Knowledge Assumed | Audio tones; the vagaries of rotary volume/tone controls |
| When useful | Retro/Lo-Fi DJing? |
Having connected your gran's (ideally mono) 'portable' cassette recorder - the size of a hardback dictionary - to your, eg, ZX Spectrum via paired mono jack plugs (one for mic, one for ear), you had to adjust the volume level and the tone (lo to hi) in order to find an acceptable pair of levels that the clunky 8-bit, 48k squishboard could understand.
Fail to adjust these correctly and your software transfer would fail rudely, four and a half minutes later, just 3 kilboytes and 24 seconds from completion.
