Fans use these codes to bypass translation hurdles and find specific creators.
These productions use binaural microphones to create a 3D soundstage.
Many RJ codes, including those in this category, are associated with ASMR or voice dramas. This is a massive segment of the Japanese entertainment industry.
The entertainment value comes from the "acting," where the listener is often a character within the story.
Digital distribution has moved this form of entertainment from physical "red light" shops to the privacy of a smartphone or PC. Entertainment Value in Voice Dramas (ASMR)