not totally sure i understand the question. the SoC is a Broadcom BCM2837. if you’re curious about the microarchitecture / instruction set, it is four Arm Cortex-A53 cores. the instruction set includes NEON SIMD. (other Cortex variants have “DSP extensions” for SIMD but for A53 it’s all NEON.) there is also the Compute Library if you are interested in doing custom heavy-lifting ML tasks on this platform.
this is most applicable if you want to do very low-level development, probably using assembly. when compiling a program (like supercollider), the compiler (gcc) will take advantage of vectorized NEON instructions when possible.
curious if it could replace my aleph craving for simpler/lighter dsp tasks.
if you mean you just wanna write some C code to do simple audio processing, yes absolutely. supercollider is provided and is a convenient high-level framework for defining musical processing. the norns lua environment is provided and is a convenient way to define knob/key/screen <-> grid/hid/midi <-> osc mapping. but you are not obliged to use either one.
one thing aleph can do that is unique is provide minimal I/O latency. norns can’t do that, it runs on ALSA/jack and has a configurable I/O buffer size that you may want to adjust depending on your specific latency/load requirements.