No sound and cant change the instrument

J
Jean posted May 12, 19:18:

I have three problems the 1st is simple when i plug my lunchkey mini , and i press the keys i have a synth soung but i cant change it , when i plug my other keyboard a yama piagerro the raspberry detect it but dont do anything and the last problem , the soung is verry low i can ear it just if i approach my ears of my jbl

Ps : sorry for my bad english im french

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