Audio containing DTMF tones is fed into the Silencer-3's input jack and audio minus the DTMF tones is fed from the output jack. The Silencer-3 contains two DTMF decoders and an audio delay. Anything the DTMF decoder detects as a valid DTMF tone is muted from the Silencer's audio output. An integral 50 millisecond audio delay in line with the audio output ensures that the muting action occurs just before the tone makes it to the audio output. The Silencer-3 can be configured, via internal jumpers, to detect any single DTMF tone or it can mute its output
whenever any DTMF tone is detected.
The Silencer-3 has two audio channels. These two channels can be configured to operate independently or can be muted together whenever a DTMF tone is detected on either input. When used as a stereo device, channel 1 is typically considered to be left and channel 2 is right.