A wavetable audio synthesis system includes a simplified burst data transmission interface and a modified wavetable data structure in a system memory to transfer wavetable data from the system memory to a wavetable audio synthesis device with reduced hardware complexity. The system memory is configured to store voice data in patches including a plurality of voice data samples beginning at an initial address and extending through a plurality of ramp voice data samples to a starting loop address. The voice data in the patches then includes a plurality of looping voice data samples from the starting loop address to an ending loop address. The voice data patches are extended by repeating the voice data samples beginning with the sample at the starting loop address and extending toward the samples at the ending loop address. The number of repeated samples extend for a number of samples equal to the size of a burst transfer. The repeated samples are appended to the voice data patches following the ending loop address.