using sound effects in ardour


To use LADSPA effects in ARDOUR projects one can just add one from the list by double-clicking in the field above the volume control in the mixer panel. But sometimes you want to use the same effect on different tracks or mix the original with the effect. If there is no Dry/Wet-mix control in the effect plug-in the latter can be done via SEND-effects. Adding the same effect to different tracks through a SEND plug-in, CPU usage is smaller than adding it to every single track. Although, once you know how it works it is quite straightforward, but I struggled a lot getting it to work.

To do so one adds a bus to the mixer panel. Then a SEND plugin is chosen by right-clicking in the effect field of the desired audio track. This plug-in can be attached to another track or bus  where one can add effects in the usual way. The important trick which finally does the job and which took  me a while to figure out is to activate the SEND connection in its context menu.by right-clicking on it. In the menu you find a activate command.

From now on all pre-fader signals from the chosen track go into the chosen bus where effects can be added. Pre fader means that you can change the volume of the original track (or even turn it down to mute) and he signal is still received by the effect bus. If the SEND is added into the field below the volume control it is a post fader send and the signal goes to the effect bus filtered.

The picture shows an actived SEND in an audio track. The levels of Bus 3 show that the signal is received.

The picture shows the mixer panel with an actived SEND plugin (pre-fader) in an audio track. The levels of Bus 3 show that the signal is received.

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