TIMARA Tech Notes
No. 4, February 17, 1995

Workstation Room

Renovation of the Workstation room has been rescheduled for June.

The plans call for eight stations plus a teacher's station, each with a Macintosh Computer, color monitor, and a Yamaha SY35 synthesizer. Two of the stations will also be equiped with Audiomedia cards, Mackie 1202 Mixers and some rack-mounted effects and synthesizers.

You can expect to see a lot more activity in the workstation room next year. Even though another computer room will be set up in Robertson for word-processing work, the TIMARA workstation room will still service people using music software such as comp students scoring with Finale, jazz students doing arrangements, music ed people trying out their pedagogical packages, and ear-training students strapped with earphones oblivious to the world while humming out of tune under their breath. In addition, expect to see the room signed out for TIMARA lectures and Synth Ensemble sessions.

There will be more people using the workstation room for their Timara course work. Plans are to turn Kristine Burn's office into a video work room and Studio 5 into a second faculty office. The Tech 103/104 students, currently using Studio 5, will then do all their work in the workstation room. Timara majors will also be encouraged to use the workstation room.

This is the reason for the two expanded workstations. These stations will be connected to a cabinet covering the back west wall. The cabinet will hold a patchbay, a reel-to-reel tape deck, a cassette deck, a DAT recorder, an ADAT, and some analog synthesizers.

At the other end the room, the teacher's station will hold a mixer with inputs from each station's synthesizer and outputs to a stereo sound system. A 21" monitor at the west end of the room along with a white board will facilitate lectures from the teacher's station.

Plans for the workstation room are now being finalized, so if you have any comments or suggestions please submit them now.

Gifts from Audio Services

Michael Schulze, Director of Audio Services for the Conservatory and Recording Engineer extraordinaire, has donated three microphones to the program.

Two Shure SM81's for Studio use only (no remote recording or concert use please) can be signed out from John Talbert's office. Also available for signout, is a Sony stereo mic useful for people going out to record with the portable DAT.

NEW EQUIPMENT !

There are new patch cords for all the studios: phone cords for Studio 5, phone and mini-phone cords for Studio 4, and TT cords for Studio 3. Please treat them well - pull the plug ends, not the cord !

The last of our budget for the year was spent on two pieces of equipment. One is a Mackie 1604 Mixer for Studio 4. For those of you who could never get the hang of how to make a noiseless mix with the Yamaha 1604, now you can do it effortlessly. This also means that we now have a Yamaha 8x2 Mixer and a Yamaha 16x4 Mixer available for concertizing.

The other purchase is a Mitsubishi HS-U59 VHS video deck. It features stereo hi-fi audio with record level controls and LED level displays, a flying erase head for clean transitions between video cuts, audio dub for recording onto the low fidelity linear audio track without having to re-record the video (useful for SMPTE sync signal), a shuttle control for easy stepping forward and back, and a jog control for moving one frame at a time.

Homebrew Equipment

From the workbench of the Timara Technician come two amazing devices!

The Roland PG1000 - the little box in Studio 3 with all the sliders - has been reprogrammed to send out regular Midi commands instead of its usual System Exclusive. Originally designed as a programming device for a Roland D50 keyboard, this modified Roland PG1000 is now a general control voltage to Midi converter. Read the Modified Roland PG1000 instruction sheet for more information.

Future plans include adding 8 external control voltage jacks to the PG1000 and, if any one is interested, a serial port to allow you to program it yourself from the Mac.

Almost completed is a video special effects box. This will enable you to take any NTSC video signal and add special effects such as color/tint changes, inversion, posterization, and solarization. Instead of trying to describe these effects I'll just leave it to you to try them out on your own.

WWW TIMARA

Timara is now on the Wide World Web! You can get to it from Oberlin Online (http://www.oberlin.edu/). This is a computer networking resource accessible through the programs Mosaic or Netscape (or Lynx from the VAX). Most of Macintosh stations around campus are connected to the network and use Netscape. (The Timara Workstation Room Macs are not currently connected to the internet).

With Netscape (or Mosaic) you can `surf' the internet and explore places such as IRCAM in Paris, the CERL computer music group at Univ. of Illinois, the Computer Music Association. You can pick up Midi files or K2000 sound files, learn about fractal music, find out what's new at Apple Computers, download free Macintosh software like CSOUND, or converse with others in your favorite Usenet discussion group.

Currently, the Timara Home page includes Studio descriptions with photos, TIMARA course catalogue, Summer Seminar description, these Tech Notes, Facts about CSound, and a list of interesting places to explore including those mentioned above.


Modified Roland PG1000

This Roland PG1000 has been reprogrammed to put out conventional Midi commands instead of System Exclusive.

The unit has 56 sliders numbered from 0 to 55. (There is also the capability for 8 external, zero to five volt, control voltage inputs numbered as sliders 56 to 63.) It also has 10 pushbuttons, 8 of which have taken on new functions as Cursor Left, Cursor Right, Field increment, Field Decrement, Slide increment, Slide Decrement, ENTER, and MIDI.

The unit has four modes of operation:

1. Edit Mode.

Each Slider has an Edit Window on the LCD display with the following fields: Slider number, slider on/off, Midi channel number, Midi operation, Midi operation data, and Slider value.

An LCD cursor can be moved to any of the above fields using the Left/Right buttons. The selected field can then be edited using the Field Increment/Decrement buttons. The edited Slider Window is only loaded into memory when the Enter button is pressed. The Slide Increment/Decrement buttons enable you to step through the Slider Windows without moving the cursor.

No Midi data is sent while in the Edit Mode. The Slider value field provides a running display of the slider value.

The unit supports the following Midi Operations:

Key#

- Midi Key On is sent when a slider movement up from zero peaks out. The key value sent is programmed in the Midi data field and the key velocity sent is the peak value of the slider movement. A note off is sent when the slider returns to zero.

Key# AT

- Midi Key On with After-touch. Midi Key On/Off values are sent as described above in Key#. In addition, a continuous Midi After-touch value is sent with any slider movement until it is returned to zero.

Control#

- Midi Controller. A continuous controller value is sent with any slider movement. The Controller number is set in the Midi data field.

Program#

- Midi Program Change. When the slider goes above a certain threshold value, the program change number as set in the midi data field is sent once. The data is not sent again unless the slider is returned below the threshold value.

Ch Press

- Midi Channel Pressure. A continuous channel pressure value is sent with any slider movement. The midi data field is not used.

Ptch Whl

- Pitch Wheel. A continuous pitch wheel value is sent with any slider movement. The midi data field is not used so that only a 7 bit value is sent.

2. Midi Run Mode.

When the Midi button is pressed, the display will change to "Midi Running" and the enabled Sliders will start sending Midi data. To get back to Edit Mode press Enter, Increment, or Decrement.

3. Setup Mode.

To enter the Setup Mode move the cursor under the Edit field labeled "Slider#" and then press Up or Down. The display will change to read "Setup# nn". There are a total of 64 possible slider setups stored in ROM memory. To load a particular setup use the Up/Down buttons to select the setup number and then press the Enter Button. The display will then go back to Edit Mode.

Setup# 00 disables all 64 sliders. Setup# 01 was designed for the Studio 3 tech class. Most of the remaining setups act like Setup#00 but are available for future customizing.

4. Forth Mode.

This mode may not be available on your unit. The unit can have a serial input/output port which connects to any computer's serial I/O. With a terminal emulation program set for 9600 baud, 8-bits, 1 stop bit, you can access the Forth language operating system used in the unit. There is a small amount of Ram memory available for implementing your own programs.

The unit will exit its Edit program loop and enter the "Forth Mode" with any key action on the computer terminal when the serial port is connected. To re-enter the Edit program just type EDIT and return.

Availability

If you would like one of these units for your own, your first problem would be in finding an original Roland PG1000. I believe they are a pretty scarce item. If you manage to find one I will be happy to program a ROM chip to replace the one already inside the machine for a small fee. Direct any questions to the email address below.


John Talbert