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Citation : Back now to the skipped button, which is labelled simply 'Key'. This relates to the compressor key insert facility, using the pair of TRS sockets on the rear panel, and is probably the most complex aspect of the device — largely because of the degree of configurability Amek have bestowed on it. As supplied from the factory, this insert send-return facility is located in the signal path at the start of the compressor's side-chain (and prior to the filters if they are allocated to the compressor). Although the insert return is normally bypassed, the send output always carries the signal which is routed to the compressor's side-chain (ie. the main signal), and can therefore be used as an uncompressed direct output.

By pressing the Key button, the insert return signal is routed through to the compressor's side-chain, allowing a more elaborate equaliser to be inserted in the side-chain for de-essing purposes, perhaps. Alternatively, an external signal could be input to control the compressor, allowing voice-over ducking, for example. The send output is normalled across to the return, of course, so that if nothing is plugged in, the side-chain signal path is maintained.

After reading this, you may still be asking yourself how you insert an external signal processor into the main signal path — a pitch-correction unit perhaps? Amek have thought of this possibility, and have included internal switches (one for each channel) which reconfigure the key insert facility to operate as a conventional channel insert. Unfortunately, accessing this switch involves removing the top cover plate, and there is no external indication that the Key Insert function has been modified from its factory default. Nevertheless, some users will undoubtedly find this a useful feature.

When reconfigured, the insert loop is positioned in the signal path between the filters (unless they are allocated to the dynamics side-chain) and the compressor input. Thus the signal can be processed externally and returned to benefit from the DMCL's compressor section. As before, the insert point is bypassed until the compressor's Key switch is pressed — not ideal labelling or ergonomics, but useful nonetheless.

Citation : Normalment non, sinon ça devrait s'appeller un "sidechain" ...

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