There are two primary approaches to attaining 64 input and 64 output channels by utilizing two Galaxy 32 SC devices. The first method involves a MADI connection, while the second method utilizes the Aggregate device functionality on Mac OS.
Method 1: MADI Connection
It is important to note that this method results in 64 channels of input/output only when operating at sample rates of 44.1 or 48 kHz. Each multiple of these sample rates will decrease the channel count by a factor of two.
To implement this method, begin by connecting the MADI output of the primary Galaxy device (the one that will utilize Thunderbolt inputs and outputs to connect to the computer) to the MADI inputs of the secondary Galaxy device. Subsequently, connect the MADI outputs of the secondary device to the MADI inputs of the primary device.
Primary Galaxy Device Routing:
In the control panel of the primary Galaxy device, navigate to the routing tab. Drag DAW OUT 1-32 to LINE OUT 1-32 and DAW OUT 33-64 to MADI OUT 1-32. Similarly, route LINE IN 1-32 to DAW IN 1-32 and MADI IN 1-32 to DAW IN 33-64. Please note that non-relevant routing components such as ADAT, SPDIF, DANTE, etc., have been omitted from the picture for clarity.
Secondary Galaxy Device Routing:
In the control panel of the secondary Galaxy device, access the routing tab. Drag LINE IN 1-32 to MADI OUT 1-32 and MADI IN 1-32 to LINE OUT 1-32.
This setup allows the 32 line input channels of the primary Galaxy interface to correspond to Inputs 1-32 in your DAW, while the 32 line inputs of the secondary Galaxy interface correspond to Inputs 33-64. Likewise, the 32 line outputs of the primary Galaxy interface align with Outputs 1-32, and the 32 line outputs of the secondary Galaxy interface align with Outputs 33-64
Clocking Considerations:
Multiple clocking options are available. One option is to transmit the clocking signal from the primary device to the secondary device via the MADI connection, eliminating the need for an additional cable connection. In this case, set the clock source of the secondary device to MADI.
Alternatively, for word clock usage, connect WC OUT 1 or 2 of the primary device to the WC IN of the secondary device. Adjust the clock source of the secondary device to WC accordingly. This applies to SPDIF and ADAT clocking as well, where the signal should always travel from the outputs of the primary device to the inputs of the secondary device.
While all of these methods are viable, using word clock (WC) is recommended.
Method 2: Aggregate Device (Mac OS):
If utilizing the Aggregate device functionality on Mac OS, please refer to the provided Apple support article: https://support.apple.com/en-us/HT202000
This method offers advantages, particularly in supporting higher sample rates. When employing this method, simply route the DAW OUTs to the LINE OUTs and the LINE INs to the DAW INs in the control panels (ROUTING tabs) of both Galaxy devices, following the desired order.
By employing either the MADI connection or the Aggregate device functionality on Mac OS, it is possible to achieve 64 input and 64 output channels with two Galaxy 32 SC devices. Consider the specific requirements and preferences to determine the most suitable method for your setup.