# Polyphase allpasses update

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• Member Posts: 834 Guru
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It's crucial to quote the whole post, and only then add partial quotes if required!

If you just use the indent partial quoting in a context where someone has asked a 'question', and there is a long discussion as a result, and then that person flags your post as 'best answer', the post will be ripped from it's correct place in the chronology of the thread and placed at the top where those indented partial quotes will become disconnected from the post they were quoting which could be anywhere in the thread.

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I don't know why I don't get a bell when somebody responds. Had no idea, wonder what happened. Others ring the bell, did you turn something off Andrew?

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Sup Laureano, keeping it real I hope. I was wondering if you had time to show me how to make a formula for a log. The one they use for computing the db for a vca that inputs the DB and outputs the linear multiplication is one. The other does the opposite, input a linear and it outputs a DB. When I studied math the teacher said," a logarithm is an exponent" like 3 times. So I figure he meant they can backfold into each others formula. The exponent is easy in excell . Like 2^3 is 2*2*2 BUT how do I write a formula for the log of 8 to the base 3 and end up with 2. I think that's what the base is, basically saying what number multiplied by itself three times equals 8. I thought it would come in handy if I ever used some math in an audio stream and was curious as it's pretty fascinating too. Thanks, hope to hear from you,. I'm sure it's easy for you.

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this is a workaround, i tuned my notification preferences as following:

i know that i definitely want to be notified in such cases

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You have db to linear and linear to db macros in core. Basically linear to db is 20*log10(x), and db to linear is 10^(x/20). If you mean a cheaper, decently good approximation, it's not really possible here. log and exp approximations in floating point need access to the bit representation, which we don't have in core. The log and exp modules come with two lower precision options -they may work for some uses, but they're rather rough.