17 Reply by little-scale

(90 replies, posted in General Discussion)

The title could be changed to "How to Chip Tune with a Game Boy".

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18 Reply by little-scale

(1,383 replies, posted in Sega)

Sure!

Well, CC#114 needs to be set above 64

Then, the GenMDM will send YM2612 page, address, and data values.

Page, address and data values are sent as a single MIDI CC message of the form:

Control number = address & 127
Control value = data & 127
Channel bit 0 = page 0 or 1s
Channel bit 1 = data bit 7
Channel bit 2 = address bit 7
Channel bit 3 = SN76489 on or off

Sync data is not needed, and may prove to be an issue.

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19 Reply by little-scale

(1,383 replies, posted in Sega)

Nice work!

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20 Reply by little-scale

(53 replies, posted in Sega)

YAY FOR SQUARE WAVES

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21 Reply by little-scale

(53 replies, posted in Sega)

It's just how I roll. I run a slightly modified version of Teensyduino, and having the channels indexed at 0 instead of at 1 makes more sense (to me).

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22 Reply by little-scale

(53 replies, posted in Sega)

Ah yeah, can you do me a favor and remove the + 1? And then re-upload the code?

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23 Reply by little-scale

(53 replies, posted in Sega)

If you are, can you do me a favor and right click on the Arduino app, go to Show Package Contents and navigate to the following file, and opening it in a text editor:

Arduino > Contents > Resources > Java > Hardware > Teensy > cores > usb_midi > usb_api.cpp

Do a search for the following line: type2 = b1 & 0xF0; and tell me what the next line of code is.

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24 Reply by little-scale

(53 replies, posted in Sega)

Are you running OS X?

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25 Reply by little-scale

(53 replies, posted in Sega)

Today I started adding support for a quad SN76489 setup from the one Teensy.

The basic functionality works great - note on / off, pitch bend and noise channels.

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26 Reply by little-scale

(53 replies, posted in Sega)

Of interest: http://little-scale.blogspot.com.au/201 … inear.html


SN76489 USB MIDI Firmware 102 for the Teensy features the following changes:
• Pitchbend is musically linear, meaning that the same value pitch bend will give the same pitch distance no matter which pitch is played.

• CC71 on MIDI channels 1 - 4 sets the pitch bend range in semitones. The default is 12 semitones.

• The frequency data for the SN76489 is calculated using a formula rather than a look up table.

• The advantage of this is there is a line of code in the program that reads: long clock = 1843200; Simply change the value of clock in Hz to support any value of crystal oscillator whilst staying in tune!

• The default is 1843200 (i.e. a clock speed of 1.8432 MHz) as this is the crystal speed that I prefer, however the SN76489 can accept a wide range of clock speeds. If you want a bassier pitch range, simply use a lower value crystal oscillator.


Download the firmware here: http://milkcrate.com.au/_other/download … DI_102.ino

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27 Reply by little-scale

(53 replies, posted in Sega)

I reckon it might be easier to mess with the pitch table BUT I want to rewrite this with a variable for clock speed anyway, thanks for reminding me!! big_smile

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28 Reply by little-scale

(1,383 replies, posted in Sega)

I would suggest starting with some that will sound quite obvious, such as:

* Preset Instrument Setting Recall from RAM    CC# 9
* FM Algorithm     CC# 14
* FM Feedback CC# 15
* Multiple OP 1     CC# 20
* Multiple OP 2     CC# 21
* Multiple OP 3     CC# 22
* Multiple OP 4     CC# 23

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29 Reply by little-scale

(1,383 replies, posted in Sega)

Try adding the Velocifier JS / MIDI effect to the MIDI track, and set the minimum to 127:

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30 Reply by little-scale

(1,383 replies, posted in Sega)

A velocity of 60 should still work, but it will be VERY quiet (GenMDM is sensitive to velocity, velocities of 90 - 127 already give a large range of volume). smile It's just the way it is with the FM synthesis and the way that it works and is mapped. :S

Is the keyboard triggering any notes at all? Is the keyboard enabled as a MIDI device? Is the keyboard enabled as a track input device with a MIDI track? Is the output of the MIDI track routed to GenMDM?

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31 Reply by little-scale

(1,383 replies, posted in Sega)

You can see a list of all available parameters here:
http://little-scale.com/GENMDM/GENMDM_1 … DM_102.txt

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32 Reply by little-scale

(1,383 replies, posted in Sega)

I assume, then, that your computer sequencer is connected via traditional MIDI and not USB? (Sorry, I just want to make sure I have a clear picture in my head!)

To change parameters with GenMDM, it is a matter of sending MIDI continuous controller messages.

What sort of keyboard are you using?

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