History of MegaDrum firmware versions

[estregan]

Where do you live ?

I'm from the Philippines, hehe. I'll try ebay and farnell. Thanks.

[dmitri]

Only frequency available here is 17.1MHz and 16.9MHz. Can I use that?

I can compile firmware versions for these crystals. Tell me the exact frequency of a crystal you want to use and I'll do it.

[Synthex]

Hello Dmitri,

The Atmega644 have a normal clock at 20MHz.
Then, what is this file : "megadrum644_16_32_20080209.hex" ?
Is it the 24MHz version ?

Thanks.
Synthex

[dmitri]

No, it's a 16MHz version. Consider it downclocked, power saving version:)

[dmitri]

24MHz firmware for Atmega644 is included now in new version.

[Synthex]

24MHz firmware for Atmega644 is included now in new version.

Thank you !

[estregan]

Changes in 20080406 version:

1. Added per input adjustable "Dynamic Threshold" parameters: Dynamic Threshold Level and Dynamic Threshold Decay Time.

Can you please explain what these new features are for?

[dmitri]

The first one determines how high the initial dynamic threshold level is relative to a hit strength.
The second one determines how long it takes for the initial dynamic threshold level to decreases to zero.

[slayer666]

The first one determines how high the initial dynamic threshold level is relative to a hit strength.
The second one determines how long it takes for the initial dynamic threshold level to decreases to zero.

dynlevel goes from 0 to 7 ,please explain how this works
and
dyntime from 8 to 64, is this measured in ms?

[dmitri]

Simplified it goes like this:
Suppose you hit a pad and it produces a peak signal of say 500. Now if Dynamic Threshold Level is set to 0 than an initial dynamic threshold for the pad will be set to a half of the peak signal, i.e. to around 250. Every millisecond this threshold will now decrease until zero. How fast it decreases depends on Dynamic Threshold Decay Time. It can be set to between 8 and 64 millisecond. If Dynamic Threshold Level were set to 7 than an initial dynamic threshold for the pad would be set to around 750.