Nope, just tried it on 1.40B,
Working normally here.
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Thanks for checking! Actually I am still on 1.40A so I guess this is fixed in B 
This seems to be fixed in the latest OS?
Bug fixes
It was not possible to access Quick mutes and activate FILL mode when in GRID RECORDING mode.
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Yeap!
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Fixed in 1.50:
Previewing a sample or a recording while on a MIDI track is now possible by letting it be previewed on the neighboring audio track.
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Also Quick mutes in grid recording mode 
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Hello guys
Plz upload the firmware file 1.40B which was available for download before 1.50 . I want to downgrade / I’m waiting for a response from support for a long time.
Welcome to the forum! Just out of curiosity, why do you want to downgrade? I’m away from my computer currently, but I can look and see if I have the firmware file in a little bit.
I figured out the url from the wayback machine ->. https://cdn.www.elektron.se/media/downloads/digitakt/Digitakt_OS1.40B.zip
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