Is it possible to use UTF8 for CLAM speech? I tried the sendtoaddress command (after fixing clamd, pull request issued) on an UTF8 terminal, so clamd should get the UTF8 string. I used this string as the CLAM speech parameter "test2 äöü 象形字", transaction: 2e7d31559f88322bbd66ea361f312c695fb62984ae133b7661cd21dcb2110366. I don't know if the UTF8 characters made it into the transaction, looks like khashier.com doesn't show it, but it looks like the typical 2 bytes UTF8 chars.
Update: khashier supports already UTF8, test with the text 嗨!: http://khashier.com/tx/e4d5c2f48e8da1c0ed800edf87281dddb9b8d1c5e612e18b173015c7946707b0
Looks like some kind of command line encoding problem on my Linux machine or in the clamd command line program.