Oli Mason

Im trying to get a tempo synced filter sweeps patch going but I'm struggling to get a smooth sweep,

i know its something to do with the filter being logarithmic, I'm thinking maybe using [expr]

I have looked over the previous post but still can't quite get get it right,

if someone wouldn't mind helping or filling in the blanks for me it would be much appreciated!

also any suggestions on improving the patch are welcome.

Im trying to get a tempo synced filter sweeps patch going but I'm struggling to get a smooth sweep,
i know its something to do with the filter being logarithmic, I'm thinking maybe using [expr]

filter-sweep-help

Couple of things: try a different filter, such as svf~ for this. It'll sound better and you can sweep it faster. Instead of using tempo to sweep it, use phasor~. You can specify the frequency of phasor~ in beat units (e.g. 1n = whole note), something like this:

This looks it to the tempo set by the transport object (make sure the transport is on...)

Then use scale~ 0. 1. 48 135. to scale the range of phasor~'s output into MIDI pitch values, then use mtof~ to convert to frequency before sending to the frequency inlet of svf~.

Couple of things: try a different filter, such as svf~ for this.  It'll sound better and you can sweep it faster.  Instead of using tempo to sweep it, use phasor~.  You can specify the frequency of phasor~ in beat units (e.g. 1n = whole note), something like this:

Then use scale~ 0. 1. 48 135. to scale the range of phasor~'s output into MIDI pitch values, then use mtof~ to convert to frequency before sending to the frequency inlet of svf~.


Hi thanks for the detailed reply, I have tried to follow but i still don't seem to any effect on my sample.

im not to familiar with the map objects, would you mind having a quick look when you get chance, i have probably got a few thing connected up wrong,

Hi thanks for the detailed reply, I have tried to follow but i still don't seem to any effect on my sample.
im not to familiar with the map objects, would you mind having a quick look when you get chance, i have probably got a few thing connected up wrong,

Hi Oli, you're really close. Something that's not obvious, is that number~ does not pass its output through like number does. It has two modes: generator and monitor. Monitor is the default, where it displays the value it's getting, but doesn't pass it through.

If you bypass it, your patch should work fine.

Hi Oli, you're really close.  Something that's not obvious, is that number~ does not pass its output through like number does.  It has two modes: generator and monitor.  Monitor is the default, where it displays the value it's getting, but doesn't pass it through.

If you bypass it, your patch should work fine.


Thats great Peter, I would never have figured that out, I'm pretty good in max but just starting out on the msp side.

Thanks for your help and giving such a detailed explanation.

Filter Sweep Help