What is the maximum range allowed for sound based Genjutsu?

What is the maximum amount of people that can be caught in Genjutsu? And
does it depend the User Genjutsu Soul Stat Rank or any other factors?

Usually, the maximum range of a sound based Genjutsu is 1000ft, that includes the usage of things suck as flutes or other devices to increase the sounds effective range.

The amount of people affected in a Genjutsu varies, mostly based on rank of the Genjutsu, but as well as how the Genjutsu works. Simply casting a Genjutsu in a populated area VIA soundwaves, a large number of them could be affected, granted there would probably be some people too busy or not notice your sound and thus be not effected. That being said, the general way a Genjutsu works is that it traps those who are affected in an illusion, merely to make them stationary and easy targets. The other way a genjutsu works is affected them and making them do specific actions based on what they see inside the Genjutsu(Which is usually manipulated by the Genjutsu caster to bring about their desired effects) Genjutsu used in this way is limited to a number of people. Such as Sheffield's A Rank genjutsu "Transmit Vision"

Spoiler:

As a general idea, if an A Rank can affect six people in this way, any lesser jutsu should target less people, while an S Rank might target more. With this being said, using a basic Genjutsu on a large number of people will likely affect all of the ones who hear it, but not likely everyone... so take these words into consideration and just RP the way you see as fair and not OP.