We don't have synonyms for dysphonic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are symphonic, dysphoric and dysphonia.
"1923: George Bernard Shaw, The Perfect Wagnerite - Finally, Mozart's most dramatic finales and concerted numbers are more or less in sonata form, like symphonic movements, and must therefore be classed as musical prose."
"1923: George Bernard Shaw, The Perfect Wagnerite - Finally, Mozart's most dramatic finales and concerted numbers are more or less in sonata form, like symphonic movements, and must therefore be classed as musical prose."