FILTERS
| Code | Name | Earliest evidence | Confidence | Files |
|---|---|---|---|---|
| M402 | 1968|1 | high | 50 | |
| M402A | Spec Sheet | 1968|1 | family | 60 |
| M402B | Effects Equalizer | 1970|3 | high | 69 |
| M404 | 1968|1 | high | 58 | |
| M404A | Hi/Lo Pass Filter | 1968|1 | medium | 81 |
| M462 | 1974|7 | high | 248 | |
| M462A | 1976|9 | high | 100 | |
| M462B | 1974|7 | high | 116 | |
| M462C | 1985|18 | high | 45 | |
| M464 | HP LP Filter | 1976|9 | high | 164 |
| M472 | 1977|10 | high | 85 | |
| M472A | Stereo Equalizer Module | 1986|19 | high | 35 |
| M522 | Input Module | 1985|18 | low (named by) | 136 |
| M522B | 1995|28 | low (named by) | 40 | |
| M522C | 1995|28 | low (named by) | 10 | |
| M562C | Stereo Equalizer Module | 1985|18 | high | 53 |
| M922 | Mono Equalizer | 1994|27 | medium | 24 |