11 thoughts on “Channel Mixer Plug-in”

1. I just downloaded the latest version of Audacity. I also downloaded your plug-in and put the unzipped ‘channel-mixer.ny’ file in the Plug-Ins folder, then restarted Audacity. When I click on the ‘Effect’ tab, I don’t see “Channel Mixer” listed there. Is it somewhere else? Am I doing something wrong?

   Thanks for your help.

   Reply

   1. Plug-in Effects appear “below the divider line” in the menu, so you may need to scroll down the list further. Alternatively, while the edit menu is open, repeatedly press the “C” key to cycle through all plug-ins with names beginning with “C”.

      Reply

2. If you have previous had Audacity 1.2.x installed and now have Audacity 1.3.12 installed you will have 2 different Audacity program folders. Both folders will have a “plug-ins” sub folder. You need to put the “channel-mixer.ny” file into the plug-ins folder for Audacity 1.3.12

   On Windows the default Audacity 1.2.x installation folder is usually called “Audacity”, whereas the Audacity 1.3.12 installation folder is usually called something like “Audacity 1.3 Beta (Unicode)”.

   The recommended version of Audacity (until Audacity 2.0 is released) is the latest 1.3.x version (currently 1.3.12). The majority of plug-ins on this site require Audacity 1.3.x (or later).

   Reply

3. OK, thanks. I downloaded Audacity 1.2.6, so that’s why it wouldn’t work. I downloaded Audacity 1.3.12 (Beta) and now your plug-in is in the list.

   Thanks for the quick reply.

   Reply

4. your plug in in french version ..
   for french users .!!

   Lisp

   ;nyquist plug-in ;version 3 ;type process ;categories "http://lv2plug.in/ns/lv2core/#MixerPlugin" ;name " 2 Channel melange .." ;info "by Steve Daulton (http://easyspacepro.com). Released under GPL v2 Trad fr godard.\n\nchoix 'utilisateur' choisir valeurs, ou sinon presets avec valeurs programmees).\nchoix 'Debug' pour apercevoir valeurs choisies. \n\n" ;action "Mixing..." ;; channel-mixer.ny by Steve Daulton, June 2010 ;; Released under terms of the GNU General Public License version 2 ;; http://www.gnu.org/copyleft/gpl.html ;; Updated 28th September 2010 ;; Updated 8th March 2011 ;control preset "choix utilisateur" choice "utilisateur,Mono (50/50),Mono (seul gauche),Mono (seul droit),stereo faible,peu large Stereo,large Stereo,Extra large,Centre a gauche,Centre a droite,inverse gauche/droit,supprimer centre (g/d invert),supprimer centre(mono),inv gauche,Inv droit" 0 ;control left-mix-L "GAUCHE CHANNEL OUTPUT \avec gauche channel (%)" real "" 0 -100 100 ;control left-mix-R "avec droit channel (%)" real "" 0 -100 100 ;control right-mix-L "DROIT CHANNEL OUTPUT \avec gauche channel (%)" real "" 0 -100 100 ;control right-mix-R "avec droit channel (%)" real "" 0 -100 100 ;; Create list of values from selected preset or from the slider values (setq channels (case preset (1 (list 50 50 50 50)) ; 50 /50 (2 (list 100 0 100 0)) ; seul gauche (3 (list 0 100 0 100)) ; seul droit (4 (list 70 30 30 70)) ; stereo faible (5 (list 85 15 15 85)) ; peularge Stereo (6 (list 100 -30 -30 100)) ; large Stereo (7 (list 100 -60 -60 100)) ; extra large (8 (list 50 50 -50 50)) ; Centre vers gauche (9 (list 50 -50 50 50)) ; Centre vers droite (10 (list 0 100 100 0)) ; glisse gauche/droit (11 (list 100 -100 -100 100)) ; centre supprime L/R invert (12 (list 100 -100 100 -100)) ; centre supprime mono (13 (list -100 0 0 100)) ; Invert gauche (14 (list 100 0 0 -100)) ; Invert droit (T (list left-mix-L left-mix-R right-mix-L right-mix-R)))) ; Print settings to debug window (format T "New Left Channel:~%Left mix = ~a %~%Right mix = ~a %~% New Right Channel~%Left mix = ~a %~%Right mix = ~a %~%\n" (nth 0 channels)(nth 1 channels)(nth 2 channels)(nth 3 channels)) ; convert percent to +/- 1 (setf channels (mapcar #'(lambda (num) (/ num 100.0)) channels)) ; mix and output as vector (if (arrayp s) ; check for stereo track (vector (sum (mult (aref s 0)(nth 0 channels)) (mult (aref s 1)(nth 1 channels))) (sum (mult (aref s 0)(nth 2 channels)) (mult (aref s 1)(nth 3 channels)))) ; or error if not stereo (format NIL "Error\nChannel Mixer demande des pistes stereo ."))

   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

   ;nyquist plug-in ;version 3   ;type process ;categories "http://lv2plug.in/ns/lv2core/#MixerPlugin" ;name " 2 Channel melange .." ;info "by Steve Daulton (http://easyspacepro.com). Released under GPL v2 Trad fr godard.\n\nchoix 'utilisateur' choisir valeurs, ou sinon presets avec valeurs programmees).\nchoix 'Debug' pour apercevoir valeurs choisies. \n\n" ;action "Mixing..."   ;; channel-mixer.ny by Steve Daulton, June 2010 ;; Released under terms of the GNU General Public License version 2 ;; http://www.gnu.org/copyleft/gpl.html   ;; Updated 28th September 2010 ;; Updated 8th March 2011   ;control preset "choix utilisateur" choice "utilisateur,Mono (50/50),Mono (seul gauche),Mono (seul droit),stereo faible,peu large Stereo,large Stereo,Extra large,Centre a gauche,Centre a droite,inverse gauche/droit,supprimer centre (g/d invert),supprimer centre(mono),inv gauche,Inv droit" 0 ;control left-mix-L "GAUCHE CHANNEL OUTPUT \avec  gauche channel (%)" real "" 0 -100 100 ;control left-mix-R "avec droit channel (%)" real "" 0 -100 100 ;control right-mix-L "DROIT CHANNEL OUTPUT \avec gauche channel (%)" real "" 0 -100 100 ;control right-mix-R "avec droit channel (%)" real "" 0 -100 100   ;; Create list of values from selected preset or from the slider values (setq channels    (case preset       (1 (list 50 50 50 50)) ; 50 /50       (2 (list 100 0 100 0)) ; seul gauche       (3 (list 0 100 0 100)) ; seul droit       (4 (list 70 30 30 70)) ; stereo faible       (5 (list 85 15 15 85)) ; peularge Stereo       (6 (list 100 -30 -30 100)) ; large Stereo       (7 (list 100 -60 -60 100)) ; extra large       (8 (list 50 50 -50 50)) ; Centre vers gauche       (9 (list 50 -50 50 50)) ; Centre vers droite       (10 (list 0 100 100 0)) ; glisse gauche/droit       (11 (list 100 -100 -100 100)) ; centre supprime L/R invert       (12 (list 100 -100 100 -100)) ; centre supprime mono       (13 (list -100 0 0 100)) ; Invert gauche       (14 (list 100 0 0 -100)) ; Invert droit       (T (list left-mix-L left-mix-R right-mix-L right-mix-R))))   ; Print settings to debug window (format T "New Left Channel:~%Left mix = ~a %~%Right mix = ~a %~% New Right Channel~%Left mix = ~a %~%Right mix = ~a %~%\n" (nth 0 channels)(nth 1 channels)(nth 2 channels)(nth 3 channels))   ; convert percent to +/- 1 (setf channels (mapcar #'(lambda (num) (/ num 100.0)) channels))   ; mix and output as vector (if (arrayp s) ; check for stereo track   (vector     (sum       (mult (aref s 0)(nth 0 channels))       (mult (aref s 1)(nth 1 channels)))     (sum       (mult (aref s 0)(nth 2 channels))       (mult (aref s 1)(nth 3 channels)))) ; or error if not stereo     (format NIL "Error\nChannel Mixer demande des pistes stereo ."))

   Reply

5. Thanks for the translation.

   Funnily enough I’ve just been talking to one of the Audacity Team people about translating plug-ins. If you’re interested in translating more effects you might like to make your interest known on the Audacity Forum “Nyquist” board and work with us on this. http://forum.audacityteam.org/viewforum.php?f=39

   Reply

6. Thanks for contributing this – very useful.

   I’m interested in automating the mixer. I’d like to toggle the channel left/right every time a label is encountered. This is for a project where I read a script, and one “character” needs to be on the left channel only, and all other characters on the right channel only. If I set a label at each transition point, then – in theory – something could toggle the channel.

   Ideas?

   Reply

   1. Unfortunately Nyquist is not able to access label tracks.
      If you would like the functionality of Nyquist to be expanded to allow it to access label tracks you could propose it as a “feature request” on the Audacity forum: http://forum.audacityteam.org/viewforum.php?f=20

      Posting to the Audacity forum requires registration and e-mail verification (like most forums) and your post will enter a moderation queue so it will not appear immediately, but posts generally get approved within a few hours.

      A possible, but slightly awkward workaround would be to export the label track as a text file (Tracks menu > Edit Labels > Export). The exported file could then be opened in a text editor (such as NotePad) and the text copied and pasted into a text input field of a Nyquist plug-in.

      Other options to accomplish the task that you describe are discussed in this topic on the Audacity forum: http://forum.audacityteam.org/viewtopic.php?f=26&t=62821

      Reply

7. I have been using your Channel Mixer Plug-In to try to rectify a cassette-to-digital transfer that was initially recorded skewed to one channel. For my purpose, how is the Channel Mixer different from the Pan Slider feature of Audacity 2.0.3 ?
   Thanks.

   Reply

   1. The Pan slider may be a bit easier to use for your purpose than the Channel Mixer plug-in because you can adjust the Pan slider during playback, which means that you can hear what you are doing in “real time”.

      The Channel mixer plug-in is more versatile and, depending on the recording that you are trying to fix, may give better results.

      When using the Pan slider, pushing the slider to one side will reduce the volume on the other side. For example; if the audio is louder on the right, you can move the slider to the left and that will reduce the level of the audio in the right channel – move it too and fro until it sounds even left and right. After making the adjustment it may be necessary to increase the overall volume, which you can do using the Gain slider (keep an eye on the playback meter so that the playback level does not exceed 0dB.

      When using the Channel Mixer effect, you can either, make the quieter side louder by increasing the gain of that channel, or you can make the quieter side louder by adding some of the other channel to the quieter channel. Because Nyquist plug-ins do not have “Preview” you will need to test different settings on short sections of the audio to see what works best (which is a bit more fiddly, but you can see the results in the waveform, which does not happen when using the Pan slider). If the original recording is a bit noisy, you may find that the result sounds better by adding some of the louder channel to the quieter channel, but note that for a stereo recording this will narrow the stereo separation (making it sound less “wide”).

      Steve

      Reply

8. I can’t find any controls for Channel Mixer. Are they supposed to be in the Effect menu? I am running Windows 64 bit and placed the plugin in this folder C:\Program Files (x86)\Audacity\Plug-Ins

   Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.