if(xml.enterbranch("FM_PARAMETERS")) {
        const bool upgrade_3_0_3 = (xml.fileversion() < version_type(3,0,3)) && // <=== should this be "||"
            (xml.getparreal("FMvolume", -1) < 0);

        PFMVoice      = xml.getpar("input_voice", PFMVoice, -1, nvoice - 1);
        if (upgrade_3_0_3) {
            int Pvolume = xml.getpar127("volume", 0);
            FMvolume    = 100.0 * Pvolume / 127.0;
        } else {
            FMvolume    = xml.getparreal("volume", FMvolume);
        }