These four channels of noise gate to each professional standard of prcd Tage filter (high pass and low pass).
Analog technology.
XLR connections (4 inputs, 4 outputs).
Rack 19 "1 unit.

UTILIZATION

The configuration is simple gnerale though asking a minimum of practice.

SOUND QUALITY

This is the high-end noise-gate. I use it for more than 10 years in the studio. No dfaillance. Submitted filters upstream of dclenchement of the door are very effective and I use them as effects from frquemment Entire. If you only need the band frequency drives between 250 and 500Hz (for example) on a track, so I do not know of any device more effective than the DS 404 to identify frquences want.
Just stay in the mode "key listen" which is designed prciser band frequency drives most dynamic dclenchera the opening of the gate (of a tom for example).
All rglages (attack, release) are ultra prcis. Nothing to say I do not know any better noise gate.

OVERALL OPINION

Everything is said above, I do it again this choice without problem. It's hardware business, also missed on scne, any robust evidence.