CONFIG_SND_SEQ_VIRMIDI (not configurable)

modulename: snd-seq-virmidi.ko

configname: CONFIG_SND_SEQ_VIRMIDI

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>SND_SEQ_VIRMIDI
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
sound/core//seq/