Random generated music tips please

[sheridan]

Hi there.

I've just completed my first performance using randomly generated notes (attached here: http://electro-music.com/forum/post-80748.html#80748). I think it's fairly good, but there is something bothering me... In the performance, Slot B (pad sound), sometimes two consequecutive notes are the same, ie. two consecutive random values are close enough to be quantised to the same note. How can I avoid this? Anyone know?

[ian-s]

I’ve pondered that question once or twice. This is one solution I thought of.
The green block gives a logic high only when both levels are the same. This logic signal offsets one of the levels to whatever interval you want in place of unison.

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NotEq.pch2
Description:	avoid identical notes in random sets	Download (listen)
Filename:	NotEq.pch2
Filesize:	3.67 KB
Downloaded:	1562 Time(s)

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[sheridan]

Thanks Ian.

I've looked at your patch and I think it's a way of ensuring notes in a chord are not the same. That's good, but I was actually after a way to ensure that two consecutive (mono) notes are not the same. I was thinking of using a sample and hold module with a delay and something silmilar to your compare circuit, but I couldn't work out how to patch it up. I'll have another look to see if I can modify your patch to do it. In the meantime, if anyone has already worked this out, I'd appreciate a fix patch.


<<Edited>> Just had a go... it didn't really work, but I've found another problem with my idea. To delay the signal to the S&H module, I need to use an audio delay which then upgrades the signal to audio level which makes it a bit DSP hungry. Any ideas anyone? I don't suppose there is a module that will take a reading of an input on receiving a clock pulse and output it at the next clock pulse is there?

[blue hell]

[sheridan]

Thanks Jan,

I'll try the cascading S&H modules idea.

[ian-s]

My idea doesn't work for serial note streams because if you get 3 consecutive identical notes, the second two will still be the same. Also, the interval you modify the note by could statistically be the next random value. see attached patch.

An alternative would be just to use 2 KeyQuant modules with mutually exclusive note selections and toggle between them on consecutive notes.

see second attachment.

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serialNotWork.pch2
Description:	does not work :(	Download (listen)
Filename:	serialNotWork.pch2
Filesize:	1.11 KB
Downloaded:	1507 Time(s)

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serialNotSame.pch2
Description:	no two consecutive notes the same	Download (listen)
Filename:	serialNotSame.pch2
Filesize:	1.36 KB
Downloaded:	1675 Time(s)

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[sheridan]