I'm Looking For "programmable" Sequencer...., that can randomize... Options

[Turner]

I'm wondering if there's any software that exists (shareware or freeware, better..) that allows one to set notes, chords, and possible sound files, and instruct the sequencer, for example, to create a 4-minute song in which a chord is played every five seconds, or every three measures, or whatever, until the song is over.

Ideally, one would be able to tell the sequencer to generate notes exactly on specific time intervals but also to be able to randomize them within user-specified limits.

What I have in mind at this point is to create an "ocean sounds" song for my kids, to have wave sounds, but also to play seagulls, wind, etc. at random intervals (within limits.)

I suppose a noise generator (for rain, wind, etc.) is OK too as long as it's randomizable.

If anyone knows of software that can do this kind of stuff, please let me know!

I looked into what it might take to create a generator to build MIDI files but I'm in over my head

thx
Andrew