case WAVEFORM_ARBITRARY:
        if (!arbdata) {
            release(block);
            if (shapedata) release(shapedata);
            return;
        }
        // len = 256
        for (i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
            ph = phasedata[i];

            switch (morphType)
            {
                case 1:
                    ph *= morph;
                    break;
                    //pwm
                case 2:
                    ph64 = ph * morph;
                    ph = ph64 & 0xFFFFFFFF;
                    break;
                    //sync
            }

            index = ph >> 24;
            index2 = index + 1;
            if (index2 >= 256) index2 = 0;

            val1 = *(arbdata + bl + index);
            val2 = *(arbdata + bl + index2);

            scale = (ph >> 8) & 0xFFFF;
            val2 *= scale;
            val1 *= 0x10000 - scale;
            *bp++ = multiply_32x32_rshift32(val1 + val2, magnitude);
        }
        break;