When using the multiplexer, the sampling rate of the analog inputs drops significantly (at 64 it is 2.7kHz), so it makes littles sense to keep treating them as audio signals and we opt for a different solution: the 64 inputs from the multiplexer are stored in an array of 64 elements called bela_multiplexer. You can then access the array from your Pd code by reading the values stored in said array. The example uses [tabread], but other options (such as [array get]) are also possible.
The values in the array are stored as follows ([x]: (a).(c): where x is the array index, a is the analog input and c is the multiplexer channel: [x]: (x/8).(x %8). For example:
[0]: 0.0, [1]: 1.0, [2]: 2.0, [3]: 3.0, [4]: 4.0, [5]: 5.0, [6]: 6.0, [7]: 7.0,
[8]: 0.1, [9]: 1.1, [10]:2.1, [11]:3.1, [12]:4.1, [13]:5.1, [14]:6.1, [15]:7.1,
...
and so on
