Which of the following is NOT a function of the mod matrix in the drum machine?

The mod matrix in a drum machine is primarily designed to manage various modulation sources and destinations, which allows users to manipulate and shape sounds in a dynamic manner. The modulation control is key to enhancing the expressiveness and complexity of the drum sounds by routing different controls.

Adjusting the envelope within the mod matrix allows for real-time alterations to the sound's attack, decay, sustain, and release parameters, effectively tailoring the sound's dynamic characteristics. The ability to control Low-Frequency Oscillators (LFOs) through the mod matrix is essential as it enables users to add periodic changes to their sounds, creating vibrato, tremolo, or other effects, enriching the overall sound palette.

However, editing waveforms typically pertains to the creation or modification of the actual sound samples used in the drum machine rather than modulation. Waveform editing involves changing the physical characteristics of a sound, such as its pitch or timbre, and is usually found in the sampling or synthesis section of the drum machine, not within the modulation matrix itself. Therefore, the task of editing waveforms does not fit within the modulation capabilities outlined in the functions of the mod matrix.