midibox Sid: where to find LFO absolute values

MIOS programming (Assembler)
1

Hi,

I am planning on customizing my midibox sid and would like to generate various midi signals (ccs, midi notes, clock etc) using the 6 lfos that are built into the Mios_Sid application.

I therefore need to be able to read the 6 lfo values at any time, convert them to 7bit and send them to tx buffer.

Please could someone point me to the 6 variables and need to work on? any ideas on converting them to 7bit (1-127 range)?

Thanks in advance!  :slight_smile:

Alex

2

Hi Alex,

the LFO values are 16bit values, which are stored in a special structure. Without loosing too much words (because I think that the data structure is obvious): with

  movff SID_LFO1_BASE + SID_LFOx_RVALUE_H, WREG

you will copy the high byte of the LFO1 output value into the working register

with “clrc” and “rrf WREG, W” you can shift it to the right in order to get a 7bit value, which could be transmitted via CC

Best Regards, Thorsten.

3

Thanks Thorsten,

now I can have a nice horizontal led visualisation of the lfo rate! ;D

The next question is obviously how to grab env 1 and env 2 values?

(of coarse, i’ll have a try first) Thanks!

Best

Alex

4

Hi Alex,

metering the modulation outputs is such a cool idea, that I couldn’t resist to built this into the v1.7303 by myself! :slight_smile:

See http://www.midibox.org/forum/index.php?topic=6098.msg37721#msg37721

In cs_menu_matrix.inc you will find the offsets of LFOs and ENVs

Best Regards, Thorsten.

5

Hi Thorsten,

I’m proud to have a bit of my brain built into your excelent SID project  :smiley:

I use the feature to animated 8 leds in a horizontal “night rider”  style to indicate the selected lfo rates.

My midibox Sid has a modular approach with software handled patch sockets to simulate connections between voices, lfos, enveloppes etc using patch leads.

I still have some bodywork to finish (lcd, pitchbender), and some software handlers to optimize but here’s a preview:

I really hate having to sit in front of a computer screen to make music, thats why I’m trying to make my midibox synthesizers as independant as possible. This one will eventually have a little amp and speakers so it can be played in a computer-free zone!  ;D

thanks again for making our beloved projects a reality!

Best,

Alkex

6

Hi Alkex,

great one! :slight_smile:

(Btw.: in my implementation, I used vertical bars, because this matches better with the lables of a common MIDIbox SID panel)

Best Regards, Thorsten.