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1993-11-29
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Apparently-To: john.smith@gravis.com
GUS Musician's Digest Mon, 29 Nov 93 3:38 Volume 2: Issue 27
Today's Topics:
Ignored tracks (2 msgs)
Making a MIDI BOX - circuit confusion ?
MIDI File Format
New Windows drivers & patch banking.
Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
Date: Sun, 28 Nov 93 9:48:46 MST
From: Stuart Yoshida <yoshida@elektra.fc.hp.com>
Subject: Re: Ignored tracks
>Date: Sat, 27 Nov 1993 13:55:46 -0400 (AST)
>From: Jurassic Mark <markus@Info.UMoncton.ca>
>Subject: Ignored tracks...
>
>GUS day everyone,
>
> I'm testing the new Windows drivers and I'm not quite impressed.
>I'm playing L1002_10.MID with MidiSoft and MediaPlayer and both tracks 12
>and 13 are completely ignored while they work under DOS and with the old
>drivers.
> Can any musical expert give me an explanation for that? And the
>drivers still miss notes at occasions.
The reason that those tracks are ignored is because the Windows
multi-media spec is written such that MIDI channels above 10 are
ignored! Don't ask me why, but that's what is written. Therefore, to
get those tracks back, simply assign them to channels between 1 and 8.
Strange but true...
I had the same mysterious track disappearance on a song I was
composing, and it completely frustrated me until I tried playing the
song outside of Windows, where they suddenly appeared again. I finally
read about this MIDI channel restriction somewhere (you would think the
people writing the standards would consider that MIDI supports 16
channels!), and it all fell into place.
--
Stuart Yoshida
Internet: yoshida@elektra.fc.hp.com
Voice: (303) 229-2324
------------------------------
Date: Mon, 29 Nov 1993 08:40:20 +0100 (MET)
From: tgakem@chem.tue.nl
Subject: Re: Ignored tracks
> GUS day everyone,
>
> I'm testing the new Windows drivers and I'm not quite impressed.
> I'm playing L1002_10.MID with MidiSoft and MediaPlayer and both tracks 12
> and 13 are completely ignored while they work under DOS and with the old
> drivers.
> Can any musical expert give me an explanation for that? And the
> drivers still miss notes at occasions.
>
> Marc Y. Paulin - Jurassic Mark (Usenet) - Extreme (IRC)
Didn't you have the same problem with the old drivers?
It sounds as though you used a standard Windows setup for the Ultrasound in
Window's Midi-mapper. For some reason or another, these setups
(I don't remember if it's called setup, but it slipped my mind) only pass
the first 10 midi-channels to the midi-instrument, and then call this an
EXTENDED configuration (? beats me).
What you should try is open the Midi-mapper, edit the 'Ultrasound' setup
(or Ultra256 .. Ultra1024) and add channel 11 to 16. If this doesn't work,
try setting a larger number of active voices in the Ultrasound midi synth
driver. With the MidiSoft software I remember you could have different
setups as well. Use general midi, not an "extended" setup.
--Eric Meijer
------------------------------
Date: Sun, 28 Nov 1993 16:38:23 +0200
From: PWRJAM01@Uctvax.UCT.AC.ZA
Subject: Making a MIDI BOX - circuit confusion ?
> --------------------------------------------------------
> Generic Midi Out/In/Through Circuit
> ===================================
>
> The following shows a typical OUT, cable, and IN circuit
>
> MIDI OUT port ---->|<- cable ->|<---- MIDI IN port +5V
> 270 |
> +5V DIN DIN +--\/\/\/-+
> | 220 +-+ +-------+ +-+ 220 +--------+ |
> |\ +-\/\/\/--|4|-|-------|-|4|--\/\/\/--| OPTO |-+-+- UART RXD
> UART | \ | | | | | | |ISOLATOR| |
> TXD ---| \---\/\/\/--|5|-|-------|-|5|----------| |-+ |
> | / 220 | | +-------+ | | +--------+ | |
> | / +--|2|-+ +-|2| 6N138 GND|
> |/ 7407 | +-+ +-+ |
> GND |
> |
> +-------------------------------------------+
> |
> | +5V DIN
> | | 220 +-+
> | |\ +-\/\/\/--|4|
> | | \ | |
> +--| \---\/\/\/--|5| MIDI THRU
> | / 220 | |
> | / +--|2|
> |/ 7407 | +-+
> GND
>
> Note that when the UART TXD is high, no current flows through
> the resistors and optoisolator's LED, causing the optoisolator's
> phototransistor to remain off, allowing the UART RXD to be pulled high
> by the 270 ohm resistor. When the UART TXD is low, current flows
> through the resistors and optoisolator's LED, turning on
> optoisolator's phototransistor, grounding the UART RXD. The voltage
> drop across the optoisolator's LED is typically 1.5 volts, leaving 3.5
> volts to be dropped across (3 times 220) 660 ohms, which allows about
> 5 ma to flow.
>
> The reason a current loop is used is that it allows an ground
> isolated interconnection. Note that the ground from the MIDI OUT
> port's device is not connected to the ground of the MIDI IN port's
> device. This prevents ground loops in systems where appropriate
> attention has not been paid to grounding issues, such as the case of
> typical musicians in a typical club!
>
> Gravis Ultrasound Circuit
> =========================
>
> 15 pin D connector
> 220R
> pin-1 +5v ----+--------------------------/\/\/\---------------\
> | \ 4
> | Gnd--2 MIDI OUT
> | |\ |\ 220R / 5
> pin-12 tr >---|------| o-----| o----------/\/\/\--------------/
> | 13|/ 12 11|/ 10
> | 220R
> +---------------------------/\/\/\-------------\
> | \ 4
> pin-15 rx <---|--------------------+ Gnd--2 MIDI THRU
> | |\ |\ | 220R / 5
> | +--| o-----| o---+-------/\/\/\------------/
> | | 1|/ 2 3|/ 4
> | |
> | +------+
> | 270R | 220R
> +--/\/\/\--+ +------+----------/\/\/\--------\
> |B |C |A | \ 4
> +-|----------|----|-+ | MIDI IN
> | 8 6 2 | ----- / 5
> | | / \ IN914 or IN4148 +-/
> | 6N138 | --- |
> | | | |
> | 5 3 | | |
> +------------|----|-+ | |
> | |K | |
> pin-5 Gnd --------------+ +------+----------------------+
>
> Inverters are 74LS04. (This is a 14-pin IC containing 6
> inverters. Connect pin 14 to +5V, pin 7 to GND)
>
> Leave pin 2 of the MIDI IN unconnected (Don't connect to ground).
> -----------------------------------------------------------------------------
This is circuit from the GUS FAQ - I want to build a midi box and
am confused with the circuit ( I am not an Electrical Engineer ! )
I have mailed the author but got no reply.
Hopefully someone here can help me ?
1] What part is this: |\
| o
|/
Is this the 7407 he refers to ?, if so is that how I refer to the part
to buy it ?
2] Is the IN914/IN4148 the inverters he talks about in the last paragraph
if not where do they go ?
3] Which circuit do I use ? - one above or first one ( I presumed the
first one was an explanation ?
4] Is says pins 2 you Ground - Ok fine but what do you ground it to -
Pin-5 on the connector ?
5] Has any one else succesfully used the 6N137 "High speed" chip instead
of the 6N138 - do it work as well - are there any other opto isolators
I can use
Thanks for the help.
James
internet: pwrjam01@uctvax.uct.ac.za
------------------------------
Date: Mon, 29 Nov 1993 00:44:25 -0500 (EST)
From: "Ryan C. Dirr" <dirrrc@ucunix.san.uc.EDU>
Subject: MIDI File Format
Where can I find the format definition for the MIDI File Format (DOS).
Any books, ftp-sites, or e-mail full text will be GREATLY appreciated.
I would like this information because:
I want to write a program which will convert MIDI Files to text and
vice versa. This is a "pet project" for a friend so he can "see"
MIDI files. It's possible that there are programs out there that
can do this, but I still want to do this for the experience...
Thanks in advance. :)
email address is: dirrrc@ucunix.san.uc.edu
------------------------------
Date: Sun, 28 Nov 1993 12:19:47 -0400 (EST)
From: "Matthew M. Nordan" <mnordan@minerva.cis.yale.edu>
Subject: New Windows drivers & patch banking.
How the hell does one use the patch banking feature of the new Windows
drivers? This is what i've been waiting for for close to a year now, and
i have no idea how to make use of it. Help!
Matthew M. Nordan OOO OOO
mnordan@minerva.cis.yale.edu OOOOOOO
OO O OO Yale College heartily endorses
OO OO every opinion expressed herein.
------------------------------
End of GUS Musician's Digest V2 #27
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