I have been researching and it seems quantities do take the Tuiseal Ginideach. Therefore,it seems ''níos mó'' also needs to take it. I want to say'' I would love to play more musical intruments''.
Could it be '' Ba bhreá liom níos mó uirlisí cheoil 'chasadh''. (a chasadh). I know '' 'sheinnt'' also exists but my question is more about the T.G. in this sentence. GRMA.

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{Is geal leis an bhfiach dubh a ghearrcach féin}

ar ndóigh



uirlisí ceoil
gléasanna ceoil

úirlisí cheóil a chasadh

here there is no need to elide the particle governing the verbal noun because it is between two consonants. it is only elided in pronunciation between vowels.

É a dhéanamh = is pronounced "é dhéanamh". If you write it é a dhéanamh, you must still know it is pronounced é ' dhéanamh.

Rud a dhéanamh = is pronounced rod a dhéanamh. There is no elision, in pronunciation or in writing.