Timbre

Doppler-ish effect applied to ... https://freesound.org/people/univ_lyon3/sounds/443123/

loopable processed excerpt of ... https://freesound.org/people/Frozentape/sounds/440980/ Sounds better when downloaded, (bit-crush is intentional)

Made from mp3 compression artifacts

deeper version of ... https://freesound.org/people/ecfike/sounds/196571/

Envelope of ... https://freesound.org/people/acclivity/sounds/440696/ Frequencies of ... https://freesound.org/people/Timbre/sounds/242095/

see title

The start of ... https://freesound.org/people/ispeakwaves/sounds/384947/ processed & looped , [Sounds MUCH better when downloaded ].

Airy loopable remix of ... https://freesound.org/people/ispeakwaves/sounds/439877/

This remix has lots of noise-reduction artifacts, but still OK for cartoon. Here is the original ... https://freesound.org/people/TheKetchupCenter/sounds/439696/

Text on spectrogram

extended remix of ... https://freesound.org/people/YellowTree/sounds/437522/

Looped processed excerpt of wjoojoo's Freesound#437702

Brickwalled stereofied version of ... https://freesound.org/people/wjoojoo/sounds/435916/

De-Clicked version of ... https://freesound.org/people/Timbre/sounds/232210/ [ & spatial effects added ]

loopable excerpt of ... https://freesound.org/people/Greek555/sounds/434844/ Processed in Fracture VST plugin.