YOU SAID:

I'm a piano out of tune. I'm a poorly strung guitar

INTO JAPANESE

私は調律が悪いピアノです。私はギターの張りが悪いです

BACK INTO ENGLISH

I have a bad tuning. I have a bad guitar tension

INTO JAPANESE

チューニングが悪いです。ギターの張りが悪い

BACK INTO ENGLISH

The tuning is bad. The guitar is not tight

INTO JAPANESE

チューニングが悪いです。ギターはタイトではありません

BACK INTO ENGLISH

The tuning is bad. The guitar is not tight