ARIES COMPARABILITY:s

All Aries Music Series-300 modules have front panels of 3-inches x 
9-inches x 1/16-inch black anodized aluminum.

SIGNAL LEVELS
Aries Musicmodules are designed to be compatible with most synthesizers.
All AR-300 Series modules require a +/- 15 Volt power supply.
The VCO outputs, gate and triggers are 10-Volt peak-to-peak signals. 
Control sensitivity of all exponentially controlled modules is 1-Volt / Octave. 
The VCAs and VCFs are direct-coupled, allowing voltage control of the amplitude
and waveshape of sub-audio frequency control signals as well as of audio signals.

Makers that use other than a +/- 15V can easy be moded with minor board 
modification to fit an Aries power supply.

Here is a list of other modular makers that have modules that are compatible 
with the Aries Music modules. Some of them are offering modules as kit so you 
can put them in you're own blank panels.

Cyndustries: are using the same panel height as Aries (9")

Digisound: are using the same panel height as Aries (9")

Modcan: are using the same panel height as Aries (9")

Motom: Almost the same height (8,75"). Kit and assembled.

Synthesizers.com: Almost the same height (8,75")

Wiard: