Synthesizer voice Eurorack modules contain all the necessary components to create a complete synthesizer voice, such as oscillators, filters, and envelopes. In addition, these modules can be connected to other Eurorack modules to create a more complex patch or used by themselves as a complete voice.

Synth voice modules create and shape audio signals through various electronic components, such as oscillators, filters, and envelopes. The oscillators create the basic audio waveforms, such as sine, sawtooth, and square waves, which are then processed by filters and envelopes within one module to shape the sound. The circuits chosen are sometimes from a specific vintage synthesizer, allowing a classic's original sound and personality to reside in the Eurorack system.

One advantage of buying a synthesizer voice Eurorack module is that it is a compact and all-in-one solution for creating a complete synthesizer voice. This can save space and simplify the process of building a modular synthesizer. Additionally, some synthesizer voice Eurorack modules have presets pre-programmed with various presets, which can be a convenient feature for those new to modular synthesizers.

One disadvantage of buying a synthesizer voice Eurorack module is that it may not be as customizable as separate modules. For example, if a user wants to use a specific filter or envelope module, they may not be able to do so if the synthesizer voice module does not allow it to be patched that way. Additionally, some users prefer the flexibility and control separate modules offer over a pre-programmed all-in-one solution.

Overall, synthesizer voice Eurorack modules can be a convenient and compact solution for creating a complete synthesizer voice. In addition, each one offers different levels of customization and control than allowed with separate modules. Having a classic synthesizer voice that is always ready to make sound without patching is a great reason to have a synthesizer voice module in your Eurorack.