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Summary of Contents for Drawmer DS301
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Page 1: Table Of Contents
SAFETY CONSIDERATIONS INTRODUCTION page 1 INSTALLATION page 2 CONTROL DESCRIPTIONS page 4 APPLICATIONS page 7 MIDI page 10 MIDI SYSTEM EXCLUSIVE page 14 TECHNICAL SPECIFICATION page 16 BLOCK DIAGRAM page 17 MIDI SPECIFICATION page 18 © DRAWMER ELECTRONICS LTD. 1995... -
Page 2: Safety Considerations
DRAWMER DS301 Dual MIDI Expander Gate SAFETY CONSIDERATIONS CAUTION - MAINS FUSE TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITH A FUSE THAT CONFORMS TO IEC127-2. 250 VOLT WORKING, TIME DELAY TYPE AND BODY SIZE OF 20mm x 5mm. -
Page 3: Introduction
MIDI velocity on the dynamics of the audio signal can be varied using the expander ratio control. The DS301 may also be used to generate a MIDI note each time the gate or expander is triggered from an audio source. Additional information is transmitted as MIDI after-touch following the note-on command. -
Page 4: Installation
MIDI CONNECTIONS Two standard 5 pin MIDI sockets are fitted to the rear panel of the DS301. The Input socket should be sent MIDI data from a sequencer, a keyboard or a MIDI controller. This data is always 'echoed' at the MIDI Output socket, rather like a normal MIDI Thru socket on equipment with three MIDI sockets. - Page 5 POWER CONNECTION The unit will have been supplied with a power cable suitable for domestic power outlets in your country. For your own safety it is important that you use this cable. The unit should always be connected to the mains supply earth using this cable The mains fuse should be a class 3 slo-blo type rated at 80mA for 220/240 Volt mains input voltage or 160mA for 110 Volt.
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Page 6: Control Descriptions
IN/ : Allows the filters to be switched out of circuit when not required. The fastest Attack time of the DS301 is attainable when the filters are switched out, due to the fact that any filter circuit has a slight inherent delay. - Page 7 Note: If the DS301 is set to Expander mode and a long attack time is set, then operating Test will only cause a slight change in level, just as an audio trigger would under the same conditions. If the DS301 is set for linked stereo operation, then the left hand Test button will trigger both channels and the right hand channel Test button will be inoperative as an audio trigger.
- Page 8 5mS to 2S. EXPAND: The Expand push button changes the operational mode of the DS301. It also enables either the Retrigger control or the Ratio control. In expand the Ratio control is active using the yellow graticule marks, and the yellow LED is illuminated.
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Page 9: Applications
APPLICATIONS The DS301 may be used either with or without MIDI to apply dynamic control to an audio signal. In traditional gating applications, the DS301 can be regarded as being functionally similar to the DS201 but with certain valuable enhancements, not least of which is the option to switch to expander mode. - Page 10 Auto should always be used when in Expand mode and speech is being processed. Using Peak: Included in the DS301 is the Peak facility which operates in conjunction with fast attack times to give a few dBs of gain to the leading edge of the sound envelope.
- Page 11 If the release time is too fast the material being processed will be cut short. Using the DS301 in circuit before adding any reverb and/or echo can help to cover up this side effect especially where the unprocessed programme source is very noisy and the normal release setting starts to allow too much background noise through.
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Page 12: Midi
With the Expand switch depressed, a Function switch setting of Duck causes the DS301 to operate as a basic limiter. The unit was never designed to emulate a full-function compressor limiter, but it is quite capable of handling routine gain control tasks when all other dedicated compressors are already committed. - Page 13 All MIDI notes generated by the DS301 have a minimum 'note on' period of 20mS and a maximum depending the envelope time settings. The MIDI note will last indefinitely if the Range control is increased towards 0dB after the envelope has be fired, and no further trigger events occur.
- Page 14 MIDI PARAMETERS PROGRAMMING The DS301 is equipped with a MIDI In socket and a MIDI Out which merges any MIDI data generated by the DS301 with incoming MIDI data. Each audio channel may be set up to respond to a different MIDI note (or notes), each audio channel can send a different MIDI note, and these notes may be on different MIDI channels if required.
- Page 15 For example, a MIDI controlled flange sweep could be triggered from an audio event and then timed using the attack setting on the DS301 set to Gate mode. Conversely, the strength of an effect can be related to playing dynamics using the Expander mode.
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Page 16: Midi System Exclusive
MIDI SYSTEM EXCLUSIVE System exclusive instructions can be sent to the DS301 in order to remotely programme or interrogate the user definable MIDI parameters from either a sequencer or MIDI controller. It must be pointed out that if nonsensical data is sent to DS301 via MIDI system exclusive messages, then garbage results will occur. - Page 17 The option to permanently store these parameters is the available, using the previously described method. (see Parameter Storage, page 13) When the envelope of the DS301 is triggered, a MIDI note is always sent. It is however possible to disable this note sending function by programming a note value of 0 (zero) as the send note number.
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Page 18: Technical Specification
TECHNICAL SPECIFICATIONS (All measurements reference +4dBu) INPUT IMPEDANCE 20K Ohm MAXIMUM INPUT LEVEL +20dBu OUTPUT IMPEDANCE 50 Ohm (balanced) MAXIMUM OUTPUT LEVEL +21dBu (balanced) BANDWIDTH <20Hz to 22KHz ±1dB CROSSTALK @ 10kHz <-86dB Wideband 22Hz - 22KHz CCIR ARM IEC A Q-Pk CCIR NOISE -90dB... -
Page 19: Block Diagram
BLOCK DIAGRAM -17-... -
Page 20: Midi Specification
Active if received Reset Not echoed to MIDI out socket Note: The MIDI input socket data is re-sent to the MIDI output socket. Midi data generated by the DS301 is merged into the data stream at the output socket. -18-...
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