Audiothingies Doctor A MOD WIGGLER USER MANUAL
Features
- 12-Bit MULTIMODE MODULATED DELAY with TAP and MIDI sync
- Vintage style MULTIMODE MODULATED REVERB
- STEREO I/Os + MIDI Input + 2x ASSIGNABLE CV inputs
- ANALOG DRY signal path with hardware KILL DRY
Front panel
| 1 | Delay time (0 to 1000 ms) |
| 2 | Delay feedback amount |
| 3 | Delay modulation amount |
| 4 | Delay output level |
| 5 | Delay feedback high-pass frequency |
| 6 | Delay feedback low-pass frequency |
| 7 | Delay to reverb send level |
| 8 | Reverb output high-pass frequency |
| 9 | Reverb output low-pass frequency |
| 10 | Reverb delay time (0 to 100 ms) |
| 11 | Reverb decay amount |
| 12 | Reverb modulation amount |
| 13 | Reverb output level |
| 14 | Delay tap tempo switch |
| 15 | Setup/Recall buttons |
| 16 | Delay on/off switch |
| 17 | Reverb on/off switch |
Rear panel
| 1 | 9V DC input | 3+4 | Audio inputs | 7+8 | CV inputs (0 to 5V) |
| 2 | MIDI input | 5+6 | Audio outputs | ||
A word of warning before using Doctor A
Make sure your monitoring system is turned off before powering on or off your Doctor A. Doctor A is capable of very high output levels, especially with a high delay feedback level reaching auto-oscillation, so please take care of your ears while operating Doctor A.
Secondary parameters
2 hidden parameters are accessible by holding TAP and turning 1 pot (see front panel layout):
| 2 | Ping-pong L/R delay time offset | 3 | Delay modulation speed |
Default factory value is 12 o’clock. These settings are auto-saved at power-off.
Memory Recall
Doctor A has 4 memories to store and recall up to 4 delay + reverb configurations, so you can have ping pong + short reverb in memory 1, spacey + concert hall in memory 2, etc… These settings are auto-saved in the active memory slot.
Useful stuff to know MIDI:
When Doctor A receives a MIDI clock, it syncs to it and pot 1 is used as a time divisor. Signal path: Both effects are processed in parallel, if you want the delay to be effected by the reverb, use pot 7 (Delay to Reverb send level).
Changing the Delay mode
ACCESS & EXIT: Hold DELAY (Delay LED will blink when activated) Use the 4 SETUP/RECALL buttons to switch modes, the corresponding LED will blink to show the currently active mode. The available modes are:
| ● ○ ○ ○ | Lo-Fi | 8-bit delay |
| ○ ● ○ ○ | Classic | 12-bit delay |
| ○ ○ ● ○ | Spacey | 12-bit delay, tape-vibe, self oscillates more easily |
| ○ ○ ○ ● | Ping-pong | The obligatory ping pong delay, with different L/R times |
TIP: In Ping-pong mode, you can access the L/R delay time offset with TAP + Feedback pot. Set it to 12 o’clock to get the traditional ping-pong effect, experiment with the other positions to get some cool L/R rhythmic effects.
Changing the Reverb mode ACCESS & EXIT:
Hold REVERB (Reverb LED will blink when activated) Use the 4 SETUP/RECALL buttons to switch modes, the corresponding LED will blink to show the currently active mode. 2 layers with 4 modes each are available. Switch between the 2 layers by holding one of the 4 SETUP/RECALL buttons Layer 1 modes.
| ● ○ ○ ○ | Small A | Short size room reverb |
| ○ ● ○ ○ | Medium A | Medium size room reverb |
| ○ ○ ● ○ | Roomy | Very colored small room reverb, great for drum loops |
| ○ ○ ○ ● | Bouncy | Ringy and very fun reverb algorithm |
Layer 2 modes
| ○ ● ● ● | Plate | The classic plate reverb |
| ● ○ ● ● | Vocal plate | Plate reverb with less diffusion |
| ● ● ○ ● | Hall A | Large size room reverb |
| ● ● ● ○ | Concert Hall | The largest available algorithm, a concert hall reverb |
Changing the System settings ACCESS & EXIT:
Hold DELAY + REVERB (both Delay and Reverb LEDs will blink) In this submode, each one of the SETUP/RECALL LED/button show/change a system parameter:
| LED/Button | Function | LED OFF | LED Blinking |
| ● ○ ○ ○ | Input | Stereo input | Dual mono input |
| ○ ● ○ ○ | Output (wet signal) | Stereo output | Dual mono output |
| ○ ○ ● ○ | CV1 | CV1 input disabled | CV1 input enabled |
| ○ ○ ○ ● | CV2 | CV2 input disabled | CV2 input enabled |
TIP: Both CV inputs can be assigned to 1 parameter. To assign a parameter, press and hold CV1 or CV2 button and simply turn the knob you wish to assign. Assignable knobs are pots 1 to 4 and pots 10 to 13 (see Front panel layout).
Inner guts access
Return your Doctor A and you will have access to some jumpers on header pins giving you the opportunity to alter the analog part of the circuit. On both L/R channels you have access to:
| Input gain | 0 / +12 dB |
| Output gain | 0 / -12 dB |
| Dry signal | On / Off (To activate Kill Dry, set both Dry signal jumpers to the OFF pos.) |
To change a setting, make sure your Doctor A is turned off, then remove and replace the jumper on the wanted position. To do this, we recommend the use of a flat head screwdriver. Be careful not to lose the jumpers inside Doctor A while doing this. We recommend that both channels are set to the same settings for best operation.
Specifications
I/Os
| Type | Single ended |
| Input impedance | 10k Ohm |
| Output impedance | 100 Ohm |
| Max input level | 19 dBu (input gain set to 0 dB) |
| Max output level | 19 dBu (output gain set to 0 dB) |
| Dynamic range | > 100 dB |
General
| Dimensions | 17,5 x 12,5 x 6 cm |
| Weight | 600 g |