default or selected kernelversion does not have config value CONFIG_AEDSP16_MPU401.
Result is shown for kernelversion 5.15.113

Audio Excel DSP 16 (MPU401 emulation)

configname: CONFIG_AEDSP16_MPU401

Linux Kernel Configuration
└─>Device Drivers
└─>Open Sound System
└─>Audio Excel DSP 16 (MPU401 emulation)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Answer Y if you want your audio card to emulate the MPU-401 midi
interface. You should then also say Y to "MPU-401 support".

Note that the I/O base for MPU-401 support of aedsp16 is the same
you have selected for "MPU-401 support". If you are using this
driver as a module you have to specify the MPU I/O base address with
the parameter 'mpu_base=0xNNN'.