Quickly added a second voice to it now, still the same link. So easy nowadays: Listened to the recording via headphones, recorded the second voice with my Olympus LS-12 pocket recorder (just one take), added the audio track with Audacity, fit it regarding timing and applied reverb to it.

https://soundcloud.com/rorosetree/boy-in-the-bubble-paul-simoncover-mit-gesanginclvocals-yamaha-moxf

Guess I'm going to do some more Paul Simon songs some time.

In addition, I've digged out my trombone I used to play for 20 years and am trying to train on it again, although after lip and cheek surgeries over 10 years ago, due to which I gave up trombone playing, the scar tissue makes it questionable whether I will achieve a sufficient lip flexibility and tension again. It would be nice if I could include a bit of real trombone playing in my synth/keys videos and audios.