eDRUMin 2.4 BETA

[frankzappa]

Are you mapping the peak amplitude from the piezo to a midi velocity linearly in the linear force?

[Rob]

Yes. Force or energy would be accurate terms. Energy is more accurate, but I think force is probably more intuitive when you're thinking about how hard you are hitting a drum. And then converting from flinear force to something resembling velocity involves taking the square root of the force because KE = 1/2 * m * v².

[frankzappa]

Yeah I tried again with a kick drum in stead of my shitty yamaha cymbals and I agree with you that the linear force method feels most accurate.

Question is why?

Maybe you are doing something in the conditioning circuit that compresses/distorts the signal (or I'm doing something in my circuit that is wrong).

I tried with BFD this time, maybe it's that.

I'm sorry for causing you to do extra work but this is not the case on my drum, not even remotely linear unless I do some kind of log-ish conversion.

[Rob]

There are a lot of variables at play.

I'm sorry for causing you to do extra work but this is not the case on my drum, not even remotely linear unless I do some kind of log-ish conversion.

Can you clarify what you are talking about here? Your drum pad connected to an eDRUMin? By log-ish conversation, I assume you mean raising your measurements to an exponent between 0 and 1 (square root is the also logish--rasing to an exponent of 0.5).

[frankzappa]

Sorry. This is a misunderstanding on my part. I should hide under a rock or something.

You are already doing this as you just said: "velocity involves taking the square root of the force because KE = 1/2 * m * v²".

When I was testing the yamaha cymbals I could not get a proper response, I suspected thet this conversion was never done because I felt I needed to apply a logarithmic curve in the edrumin settings for it to respond properly. However now in BFD when I use my kick drum in the edrumin, it is not needed.

I have no clue what was goign on. I have to test with superior drummer again, perhaps it's that, it's on my other PC.

[Rob]

As I said in our private messages, some of the non-linearity has to do with how eDRUMin devices condition signals, and the non-linearity will be exaggerated with cymbals. The conditioning is required in order to support both peizos and switches. ED12 will perform better in this regard as the TIP and RING connections will have slightly different frequency responses. The Ring input is identical to all current eDRUMin devices, but the TIP connection is less sensitive to high frequencies and should perform better with cymbals, especially noisy ones.

[Rob]

I posted build 2.

• Fixed advanced setting for hihat not working properly.
• Fixed turning on / off expression curve has a display issue with the first Bezier control point.
• Added support in Linux installer for Fedora and OpenSUSE.
• Fixed a rare transient alignment issue that could cause issues for Edge Sense or add jitter.

[Rob]

I posted build 3. This build should improve support for Yamaha pads / cymbals. Here are some of the issues I *tried* to address:

• Unabled to trigger bell immediately after choking the cymbal.
• On smaller worn out Yamaha pads, sometimes a hard hit to the rimshot would end up triggering cross-stick.
• Improve bell reliability when using a Yamaha Adapter for rides that normally use 2 inputs.

I don't have many Yamaha pads to test with, so it would be great to hear any feedback from those who do, especially anyone using an adapter to make their dual input ride trigger trigger like a Yamaha.