Abstract: An apparatus comprises a data receiving module, a synthesizer module and a mix-in sample module. The data receiving module is configured to receive a plurality of Musical Instrument Digital Interface (MIDI) data signals. The synthesizer module is configured to analyze the plurality of MIDI data signals to generate a plurality of audio signals corresponding to the MIDI data signals. The synthesizer module includes a mix-in sample module. The mix-in sample module is configured to receive an original sample from a plurality of samples, select a mix-in sample for the original sample, determine a mix-in velocity percentage for the mix-in sample, alter the original sample based on the mix-in velocity percentage to generate an altered original sample and generate an altered audio signal based on the altered original sample and the mix-in velocity percentage.