What would changing volume trimmer resistance do to the taper?

[Guitarfreak]

I have a project that came with a 15k trimpot and I am thinking of replacing it with a 250k pot instead.  It's a BYOC project and it says values from 10k-500k can be used.

[~arph]

I don't quite understand the question.

If you replace the 15k with a 250k with the same taper it does nothing to the taper.

What project is it and what trimmer in that project is it?

[Guitarfreak]

I don't quite understand the question.

If you replace the 15k with a 250k with the same taper it does nothing to the taper.

What project is it and what trimmer in that project is it?

Incorrect terminology, what would it do to the 'sweep', and or 'tone'.  Would it be a good change?  It's a BYOC confidence boost.  The schematic is for download on the site.

[~arph]

1. You will have a higher maximum output level.
2. It will be a bit more bassy.

The .1 and the trimmer form a highpass filter.

At 15k it filters below 106 Hz
At 250k it filters below 6 Hz.

I recommend replacing the trimmer with a 100kA (log) pot. Which is the general volume pot value used everywhere.
If you don't want an external pot, replacing it with a trimmer of 100k or 250k is fine and recommended

[Guitarfreak]

1. You will have a higher maximum output level.
2. It will be a bit more bassy.

The .1 and the trimmer form a highpass filter.

At 15k it filters below 106 Hz
At 250k it filters below 6 Hz.

I recommend replacing the trimmer with a 100kA (log) pot. Which is the general volume pot value used everywhere.
If you don't want an external pot, replacing it with a trimmer of 100k or 250k is fine and recommended

Excellent advice, thank you.  I definitely want an external pot and not a trimpot.  The reason I am thinking 250k is because I like DiMarzio pots in my guitars and if at all possible I would use a 250k pot in the pedal as well, but it does seem that 100k would be a better choice.

What does raising the output impedance do to the effectiveness of the pedal?  I've heard that it is generally better to have low output impedance, but nobody ever really gave values, percentages, relationships or even a backstory to reason.

[Guitarfreak]

I built my circuit today and unfortunately only got about 30 seconds before work to plug it in and play with it. I think there may be a problem because when the circuit is active it makes my gain channel sound like I am playing on the neck pickup. I thought at first that this was because the level was overloading the input of the amp but when I turned the trimpot down it just got quieter. My assumption as of now is that the problem is the output buffer.  I think I may raise it to 100k. Any other ideas?