Signal Generator Mod?

Hi !
I have recently acquired a Grundig FG4 signal generator.
https://www.radiomuseum.org/r/grundig_pal_servicegenerator_fg4f.html
Basically the device generates signals for servicing CRT TV (color bars, crosshatch, etc). It is quite old from early 70s.
I was wondering if it could be modded into something that would generate more creative patterns ?

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