Problem with Baby 8 cd4017 not consistent steps

[orangetones]

I have built a sequencer using the schematic found on this page:

https://hackaday.com/2016/01/14/oh-baby-baby10-build-a-classic-analog-music-sequencer/

But it seems when I put switches between the outputs of the 4017 and the LED/Pots to cut out a step, the timing changes. It seems to pause longer on the step that is missing. In other words, it doesn't keep the same consistent beat. It is as though the timer takes a little extra time on the missing step.

Can anyone help with why this might be happening? I can definitely post more info and even a video with the sound/problem if needed.

Thanks

[PHOBoS]

Are you powering it from a battery ?
It sounds like a pot/LED cause the supply voltage to drop somewhat which will make the oscillator run faster.
So it runs slower on a step without a pot/LED. An oscillator like this will be less affected by changes in the supply voltage.