The TAI-4 by Vermona is a 2x2 channel audio interface module for balancing signals coming from the modular system and for unbalancing audio signals that are sent to the modular.

Unlike other modules of that kind that work with electrical balancing, the TAI-4 has isolating transformers and thus features true balancing. The upper part of the module consists of two identical channels with balanced XLR (female) connectors as inputs and 3.5mm mono minijacks as outputs. Rocker switches serve for adjusting levels (0dB, +6dB, +12dB). The bottom part has two output channels with 3.5mm minijacks as inputs and XLR males as outputs. We find rocker switches for adjusting levels as well (-12dB, -6dB, 0dB).