Adobe Illustrator 8 Shading Procset
Contents
1. the worse this noise was 2 A clicking sound in the main mix output due to crosstalk from the two Trigger Out signals which are driven by the Hi Tom and Low Tom channels These are not audible if the Tom sounds are in the main mix and they may not be audible if there are many other drum sounds at the same time However if the Toms are triggered while the Toms Volume pot is turned down then these clicks may be audible in the main mix output Of course there are still other background noises in the machine if the Volume pot and or the external mixer s gain are turned up high LEDs The LEDs are now Blue except for the Run Stop which is Red New Tact Switches All tact switches have been replaced with Omron sealed tact switches These are sealed against dust and liquids Since dust seems to be the primary or sole cause of the original unsealed ALPS switches becoming erratic we believe the Omron switches will probably last for a very long time ideally decades Accent Button A red pushbutton on the right of the machine activates Accent This does not affect the state of MIDI Out events sent by the QS 303 Individual Outputs There is a 3 5mm socket for each volume control BD SD Toms CY and HH When a plug is inserted that signal does not go to the mixing bus but comes out of the plug pure and unmixed with anything else CY HH External Audio Input This is a 3 5 mm socket near the LT and HT trigger outputs The Cymbal and HiH2. a lead which is tucked inside the battery compartment meaning that C cell batteries cannot be used The MIDI In and Out functionality of this USB interface is selected in the QS 606 s Config mode In this machine the USB connection is available via a Mini USB socket located on the rear of the machine between the Headphone and Audio Out sockets Furthermore this connection is electrically isolated from the QS 606 itself using a remarkable device the Analog Devices ADUM4160 which integrates two chips coupled by five tiny 1GHz transformers This should protect the QS 606 from damage due to static electricity and excessive voltages due to capacitive coupling from power adaptors It should also eliminate noise due to ground loop problems which would otherwise be caused by a USB connection It is possible that noise could be generated by this arrangement if for instance the computer to which the USB cable connects has a significantly different ground voltage from the TR 606 s ground voltage For instance if the computer was grounded but the TR 606 was not and the TR 606 was free floating running from batteries or being driven by a mains adaptor which capacitively couples mains voltage and or switch mode power supply high frequency noise to the ground of the TR 606 Another example would be the TR 606 grounded such as by connection to an audio system which was grounded and the computer not being grounded Normally a laptop computer will not b
3. REAL WORLD INTERFACES User Manual for Modified TR 606 Robin Whittle 9 December 2013 Quicksilver 606 from SocialEntropy com This TR 606 has the QS 606 installed which replaces the TR 606 s original CPU and memory The QS 606 stores all its data in its own non volatile memory so there is no need for any internal lithium battery or for C cells to retain its data The QS 606 cannot work with the 32 Bank Memory system which is one of the mods we do for the TR 606 Please see the separate user manual and other documentation for how to operate the QS 606 which replaces all the internal sequencer functions including receiving DIN Sync Sending DIN Sync is unaffected by the QS 606 since this is done by the TR 606 hardware rather than its now removed CPU when the Sync switch is set to Out Ordinarily the QS 606 has its MIDI In and Out connections via adaptor leads which plug into mini DIN sockets In this machine MIDI In is via the Sync socket and MIDI Out is via an adaptor lead which connects to a 3 5mm stereo socket near the Sync socket The connections for this are DIN pin 2 centre Ground Ground of the 3 5mm plug DIN pin 4 220 ohm pullup to 5V Tip o the 3 5mm plug DIN pin 5 220 ohm active low data drive Ring o the 3 5mm plug Ordinarily the MIDI out signal comes directly from the QS 606 s CPU chip It is theoretically possible that excessive voltages on the MIDI Out lead could damage the CPU chip In this mach
4. at circuits normally operate by filtering distorting gating filtering a mix of six square wave signals which are produced internally This is what happens when nothing is plugged into this socket When a plug is inserted this socket becomes an audio input which takes the place of those six oscillators Therefore Cymbal and HiHat sounds will be made from whatever signal is put in through this socket A good start is a continuous bright high chord Be sure to vary the signal level since this greatly affects the sound which results Use line level signals not the outputs of a microphone You can t really overload this so try sticking all sorts of signals into it This is not a means of triggering the CY or HH circuits They still must be triggered by the Sequencer or external inputs on the AS Box this is simply an input for an audio signal for the circuits to process Due to crosstalk inside the machine it would be impossible to shield everything in an instrument of this small size when you put an external signal into this socket the standard six oscillator mix seems to go to a higher level probably due to not being loaded This may cause some cross talk into the main output High input signals to this socket may also cross talk into the main output Noise Source Level Trimpot The TR 606 contains a white noise source based on a noisy reverse biased transistor This is used for the Snappy noise component of the snare and for a low rum
5. ble with the Toms There is a single rumble circuit which is triggered by either Tom circuit There is a trimpot which controls the level of this noise source I have altered the range of this trimpot to enable much higher than normal noise levels when turned clockwise The trimpot is now mounted on the bottom of the main circuit board and can be adjusted with a small flat blade screwdriver via a new hole in the bottom of the machine Switchable Snare Modifications The Snare circuit consists of a Twin T resonator circuit which is made to oscillate with a naturally exponentially decaying sine wave due to the energy it receives from the Trigger pulse That pulse is lms long and is normally about 5V On an accented beat the voltage can be between 5V and about 14V On accented beats according to the higher voltage of the Trigger pulse the Twin T circuit resonates at a greater amplitude initially and so resonates for longer The Trigger pulse also drives a noise gating circuit There is an approximately white flat spectrum noise source inside the machine for the Snare and Tom circuits based on a noisy reverse biased transistor emitter base junction The gating circuit has a high pass filter to make the snappy noise pulse from the broad spectrum internal noise signal This modification involves two three position toggle switches which are mounted at the left of the machine The left switch controls the noise part of sound and the right swi
6. e grounded since it is running from its own batteries or from a non grounded power adaptor Alternatively neither the computer or the TR 606 could be grounded and there may be some significant difference between their ground levels Any significant difference between the ground voltage of the USB driving device and the ground voltage of the TR 606 could couple noise capacitively inside the TR 606 The solution is to ground both devices by some means or if this is not possible for one or both of them to disconnect them from the most likely source of capacitively coupled noise which is their mains power adaptor Normally the TR 606 would be connected to other audio equipment such as a mixer or amplifier in which the audio leads cause there to be a common ground voltage for all connected devices A laptop computer may not be amenable to such grounding but if you take a 3 5mm lead from its headphone or microphone socket and plug that into your audio system even without using the signal at all this should be a good way of grounding the laptop Unfortunately laptops and desktop PCs are electrically very noisy and such connections might cause problems in the entire audio system Two Noise Reduction Mods As part of the basic work on this machine I have made changes which entirely or almost entirely eliminate two sources of noise 1 An interfering buzz in the Cymbal and Hi Hat circuits caused by front panel LED current The more LEDs which are on
7. ine the MIDI Out signals is driven by a transistor buffer which is highly resistant to such voltages The transistor is driven by a logic gate buffer so the QS 606 CPU is entirely protected from excessive voltages In accordance with the MIDI Standard the MIDI In connection of the QS 303 is isolated from the CPU and from the ground of the TR 606 by a LED to phototransistor opto isolator This protects the CPU from excessive voltages Normally a MIDI In socket uses only the signal pins 4 and 5 while the MIDI out socket also has a ground connection on pin 2 the middle pin In this TR 606 since the Sync socket is used for MIDI In and since the Sync socket s pin 2 is connected to the TR 606 s ground by a 22 ohm resistor the ground of the TR 606 is not isolated from the ground of the MIDI device which is driving the MIDI In cable This could in principle lead to ground noise being imposed on either device However the 22 ohm resistor is likely to reduce the impact of any such ground noise problems Ground noise problems can be complex and hard to diagnose If you have any such problems please experiment such as be removing power adaptors and using batteries instead or by trying alternative power adaptors audio leads and connection arrangements If the problems persist please take notes of all the details and let me know by email The QS 606 has a USB port for firmware updates and USB MIDI Ordinarily this is available via a socket on
8. tch controls the resonant sine tone part These two switches are just to the right of the row of 4 memory switches adjacent to the Sync socket These switches control four changes to the Snare sound o Lower the frequency of the Twin T resonator somewhat o Increase the mix level of the Twin T resonator o Lower the filter frequency for the noise pulse to give it more mid frequency oomph o Further lower the filter frequency of the noise pulse making it significantly louder Noise switch Tone switch Up Normal Normal Centre Noise pulse contains Tone has lower more mid and low frequency frequencies and so is somewhat louder Down Noise pulse contains Tone is louder and has still more mid and lower lower frequency frequencies and so is significantly louder
Download Pdf Manuals
Related Search