Monday, 24 June 2024
NLC - More (cowbell drum module) - Build notes
Monday, 12 July 2021
Korg Midi Synchronizer - KMS 30
Most DAWs will also use a 24 PPQN signal
It uses the same 5 pin cable/socket, but the PPQN is 48.
When syncing Roland and Korg gear via DIN sync, they will work, however the Korg machine will run at 1/2 the tempo/speed of the Roland unit.
The TR 707 & 727 drums have MIDI, DIN SYNC and TAPE SYNC sockets.
When set to be the slave it does not send any sync signals.
Thursday, 3 June 2021
Roland Index
+TB 303
+ Intro & Setting up
+ Pattern write
+ Track Write
+ TR 909 Drum
+ Roland TR 909 Programming Tutorial - getting started
+ Roland TR 909 - How to Program
+ Roland Tr 909 - Drum Mapping & Midi triggering
Friday, 9 October 2020
Online 808 . 303 emulation from Roland.
There is no excuse not to add this to your bookmarks.
Saturday, 19 September 2020
How to Program a Roland TR-808 - Quick start guide
Roland TR 808 - Quick Start
The 808 is a pretty basic machine that isn't too complicated to program, though it has a few odd quirks that are good to know. Before, you write any new patterns, it's important to clear the old ones.
How to clear old patterns
1. Turn on with the top left power switch
2. Turn the MODE knob all the way to the left, to "Pattern Clear".
3. Choose which memory location you wish to erase by pressing one of the
16 step buttons.
4. The "Basic Variation" switch needs to be in the AB position.
5. Press the Red "Pattern Clear" Button
yOU will see the AB LEDs flash really fast
How to program a simple pattern (1st Part rhythms)
8. Program your beats by pressing the step buttons (step mode) or the TAP button
(Tap mode)
9. If you flick the Basic variation to B you can program the steps 17 to 32.
The B LED will light up. (Keep the MODE Knob on "first Part")
Setting the variation to A/B will play steps 1 to 32.
How to Play existing patterns
1. Turn on with the top left power switch
2. Turn the MODE knob all the way to the left, to "MANUAL PLAY".
3. Choose which rhythm you wish to play by pressing one of the
16 step buttons.
4. You will notice that the LED above the step button will flash.
5. The "Basic Variation" switch has 3 modes (A, B, and A/B) which gives you a total of 32 sixteen step patterns.
5a. Set the Basic variation to A. The A LED will flash.
6. Adjust tempo
7. Press the START/STOP Button
8. If you set the variation to B, steps 17 to 32 will play.
Setting the variation to A/B will play steps 1 to 32.
------------------------------------------------------------------
The Second Part
7. Press the START/STOP button when programming is finished.
How to program two 12 step patterns
If the mode selector is on the 2nd part, then the LEDs will indicate the 2nd part only.
If the mode selector is on the 1st part, then the LEDs will indicate the 1st part only.
11. Press the START/STOP button when programming is finished.
---------------------------------------------------------------------------
I/F Variation Switch
I/F Variation = Intro or Fill-in Variation A or B
This performs the same function as the BASIC VARIATION switch, except it is only used for INTROs and FILL INs and relates to the last four white STEP buttons.
Intros and fill ins are additional rhythms separate from your basic rhythms. You add an intro at the beginning of your main rhythm, and a fill-ins between different basic rhythms.
The selected "White Pattern" will automatically play every 16 or 8 or 4 measures etc
You can turn the Intro/fill function on and off by pressing the TAP button.
When you first turn the mode to "play" you will see two LEDs lit:
a) One from the 1 -12 group (flashing LED)
b) one from the 1 - 4 group (solid LED)
Pressing the start button will play the rhythm as standard.
BUT
If you press the TAP button first, the 1-4 LED will start to flash.
Now press the START button and the selected intro rhythm will play before the basic rhythm.
To disable this function just press the TAP button again, and the LED will stop flashing.
--------------------------------------------------
Setting the Pre-Scale.
If you are playing a pattern and decide to change the pres-cale switch, don't forget to also press the red Pres-cale button.
1. STOP the Rhythm
2. Set MODE to PATTERN CLEAR
3. Press a BASIC rhythm button (1 to 12)
The LED should light up but not flash.
4. Set the Basic Variation switch to A
5. Press CLEAR button
6. Set MODE to PATTERN WRITE 1st PART
7. press START/STOP button
8. Set the Pre Scale selector switch to #3
9. Hold the CLEAR button down & press switch 12 at the same time.
10. Release the CLEAR button
You have just set a 12 step pattern using a #3 Pre Scale.
Example 2: (basic 4/4 beat)
Create a 16 step pattern using the #3 pre scale
Example 3.
You can change the time signature of existing rhythms without erasing them.
1. STOP the Rhythm
2. Select a BASIC rhythm button (1 to 12) to edit
The LED should light up but not flash.
3. Set the Basic Variation switch to A
4. Set MODE to PATTERN WRITE 1st PART
5. press START button
Your rhythm will play.
6. Set the Pre Scale selector switch to #3 (for example)
7. Hold the CLEAR button down & press switch one of the step switches (1 - 16)
at the same time.
8. Release the CLEAR button
------------------------------------------------------------------------------------------
Composing the Rhythm Track
Play/Compose/Track Clear
Friday, 4 September 2020
Roland Tr 808 repair - Part 2 - replacing the switches
Repairing a Roland TR-808 - Part 1
Now that you have opened up the beast you'll need to unplug the board from its various connectors.
You can just make out 4 of them here.
The connectors are 40 years old & probably brittle ... take care.
The other 2 are tucked at the rear ... They plug into the PCB connecting the inputs & outputs.
Next you need to separate the main PCB from the front panel.
It's held in place with the remaining screws (11) & the nuts/washers for the pots & rotary switches.
(Mine was missing lots of nuts/washers.... I reckon they would have been once present).
These screws circled in green are the ones that are left
Remove the central screw last, and the PCB should just pop out.
If you look at the PCB carefully, you can see it's actually two boards joined just right to the last of 5 central switches
The Main board apart from housing things like the cPU & RAM, also has some of the voice circuits:
Snare, Claps, Maracas, Hi Tom/Conga, Mid Tom/Conga, Lo Tom/Conga, Bass Drum, Claves/Rimshot.
The Voicing Board has the circuits for the Cowbell, Cymbal, Open Hat, Closed Hat,
Mixer, & master Volume.
Now it's time to remove the step switch board
That volume pot (extreme right) is definitely not original.
I'll replace it one day! At the moment, it's working fine ... I prefer to let sleeping dogs lie
iT'S held in place with 7 screws. They sit on standoffs.
Careful you don't break the ribbon cable
The FFC - flat flexible cable.
Admire those ICs
The 4051 is a multiplexer -- a digitally controlled switch
The 4 ICs on the top (D444C) are the memory.
I think they are 4K SRAM chips ???
This D650C is the CPU. It's the brain of the 808
You can also find a similar CPU the TR 606 (the 606 uses a D650C 128)
They are super rare . It's a 4 bit microcontroller
The UPD650C-085 is a special custom Roland (version 0.85) chip. It manages 11 analog channels with individual gain mix.
The voice board generates 16 analog percussions which 8 of them are circuit-shared.
The felt shades help to keep dust out.
There were originally shades on the toggle switches, rotary switches and all the pots I think ,
but mine are mostly gone ;-(
Next time I open this I must remember to put new ones in.
Notice The JRC 4558 (Japan Radio Corporation) in the bottom of the pic -- they are dual Op-amps.
These are everywhere on this board
The HD 14584 B is a Hex Schmitt trigger
The AN6912 is a quad comparator
4013B - Dual type D flip/flop
4001 - Quad 2 input NOR gate
14584BP - Hex Schmitt trigger
The new board is on top.
Its a Technology Transplant board.
The colours, esp the white buttons are slightly different.
Maybe the passing of time has faded the white switches
Screw in your new step board & reassemble the machine
The PCB should slot into the front panel.
Plug the connectors.
That green cable is the ground.
hOPEFULLY it works
Roland Links
+TB 303
+ Intro & Setting up
+ Pattern write
+ Track Write
+ TR 707 Drum
+ Roland Tr 707 - Drum Mapping & Midi triggering
+ Roland Tr 707 Drum - Basic programming
+ Pioneer Squid - Midi Mapping a Roland TR 707
+ TR 808 Drum
+ Repairing a Roland TR-808 - Part 1 - Opening the Machine
+ TR 909 Drum
+ Roland TR 909 Programming Tutorial - getting started
+ Roland TR 909 - How to Program
+ Roland Tr 909 - Drum Mapping & Midi triggering
+ SE-02 (Studio Electronics / Roland)
+ Transposing sequences with the keyboard
+ Filter/Amp envelope





























































