Electronic instrument designer keeping in low sound (6)

I believe the answer is:

mooing

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'electronic instrument designer keeping in low sound' is the definition.
I can't tell whether this defines the answer.

'keeping in low sound' is the wordplay.
'keeping' is an insertion indicator (some letters kept inside).
'low sound' becomes 'moog' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' placed into 'moog' is 'MOOING'.

Can you help me to learn more?

I've seen this clue in The Independent.

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