BassBoy manual ENG rev1_2.cdr
Contents
1. MIDI LEGEND 8 JUMPER FREE Figure 1 3 CHANNEL amp MODE JUMPER POSITION MIDI control Selection of SAW or SQUARE wave is done via Program Change where Program 1 is SAW wave and Program 2 is SQUARE wave then sequentially repeats SAW wave as Program 3 SQUARE wave as Program 4 and so on until Program 128 The unit has two ways of interpretation of received MIDI notes SEQUENCER MODE and LIVE MODE Interepretation mode is selected via jumper located on connector labeled as CH amp MODE while reproduced notes are within range from MIDI note 24 to MIDI note 72 C1 C5 The unit doesn t support MIDI pitch change control Duration and level of envelope only affects the filter In case that note has accent then it also affects the controlled amplifier SEQUENCER MODE is mode in which the way of playing current note depends on the way the last note was played The way of playing the note is defined by it s velocity which is shown in this table Velocity 0 NOTE OFF It has the same meaning as a standard MIDI message 80 note 00 This defines end of duration of audibility GATE of the same note Velocity 1 16 NOTE OFF Note is being turned off unless the previous note had a SLIDE function in which case it lasts as long as the GATE of the same note Velocity 17 32 NOTE OFF SLIDE Similar to the previous case but this time note stays on until the next note Velocity 33 48 NOTE ON Duration of the note2. is defined by the GATE It turns the note on and triggers the envelope but it is applied only if the previous note doesn t have SLIDE turned on portamento gradual slide from previous note to current note If the previous note had SLIDE turned on then envelope wouldn t be triggered and only SLIDE effect would be executed Duration of the envelope is defined by MIDI command CC 57 Velocity 49 64 NOTE ON SLIDE Duration of the note is until next note and is not defined by GATE It turns the note on and triggers the envelope but it is applied only if the previous note doesn t have the SLIDE turned on If the previous note had the SLIDE turned on then envelope wouldn t be triggered and only the SLIDE effect would be executed Duration of the envelope is defined by MIDI command CC 57 Velocity 65 80 NOTE OFF ACCENT Same as NOTE OFF Left for compatibility reasons Velocity 81 96 NOTE OFF ACCENT SLIDE Same as NOTE OFF SLIDE Left for compatibility reasons Velocity 97 112 NOTE ON ACCENT Duration of the note is defined by the GATE It turns the note and triggers the envelope but it is applied only if the previous note doesn t have SLIDE turned on If the previous note had SLIDE turned on then envelope wouldn t be triggered and only SLIDE effect would be executed Duration of an envelope is a constant 250mS Value of the accent is added to the level value of the note Accent is defined by the MIDI command CC 58 Vel
3. 7 Volume default value 127 Astandard defined CC message output volume level In 127 steps 0 5dB where value 0 is value for MUTE and value 127 Odb relative maximum output level Steps are logarithmic and transition between the steps is linear for a smooth transition Midi CC 53 Filter Pre Gain default value 0 Controls input signal level into the filter Low value hard resonance but soft sound Higher value lower resonance but harder sound Values from 0 to 127 Midi CC 54 Cut Off default value 0 Controls cutting frequency of the filter Works in conjunction with command CC 56 Values from 0 to 127 Midi CC 55 Resonance default value 0 Controls the signal level brought from output to input of the filter Feedback Values from 0 to 127 Value 112 is optimal while 127 is near the self oscillation of the filter Midi CC 56 Envelope modulation default value 0 Controls the signal envelope level brought to the control level of the filter and affects the cutting frequency of the filter Envelope is logarithmic Values from 0 to 127 Midi CC 57 Envelope Decay default value 0 Controls duration of the note without accent Values from 0 to 127 Duration from 250mS to 2s Midi CC 58 Accent default value 0 Controls intensity of the accent on notes with accent Values from 0 to 127 When in CC 55 resonance is minimum value envelope which comes to filter is logarithmic but when CC 55 resonance is at ma
4. BASSBOY MONOPHONIC DIGITAL MIDI CONTROLLED BASS SYNTHESIZER CREATED BY Aleksandar Krsti POWERED 4 MikroElektronika SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD making vk siw ple technical support andigo office gmail com BassBoy BassBoy BassBoy is a monophonic digital MIDI controlled bass synthesizer Device receives all information MIDI input MIDI IN connector Sampling frequency is 31 25KHz which generates audio range up to 15 625Khz Although it s based 8 bit processor the signal processing inside the unit is 16 bit The unit consists of oscillator which generates SAW amp SQUARE WAVE using 16 bit band limited wavetables thus making the number of harmonics limited After that the signal itself goes through a simple implementation of MOOG filter whose frequency range is chosen by MIDI commands and which is affected by the level of the envelope The filtered signal then comes to the controlled amplifier which creates the signal shape and in the end through DAC 8762 and pre amp circuit goes to the audio jack 6 35mm The unit is mono and 6 35mm jack is also used as carrier for the circuit board itself So wa RIB RI2 CS Figure 1 1 BassBoy IMPORTANT It is crucial that the power supply unit connected to the BassBoy PS connector is within specifications 10V to 13V max MIDI channel and the note interpretation mode from now on refered to as CH amp MO
5. DE connector must be chosen before turning on the unit The location of the jumpers for choosing MIDI channel and the note interpretation mode is shown on the fig1 3 POWER MIDI ON RECEIVE Low Current LEDS or LEDS with mcd gt 200 MIDI INPUT DIN5 Female Connector Front View eae gr L EO 9 B 2 zm oi or INPUT DC 10 13V wy Of 6 Soon J Audio Output LO EA CHEMODE Figure 1 2 Wiring diagram MikroElektronika BassBoy technical support andigo office gmail com 2 mipi co P MIDI CH10 H MIDI 88 MIDI CH11 Bsa I MIDI 8 Bi MIDI CH12 5 8 MIDI CH12 8 8 5 5 5 5 5 5 5 CH13 88 88 ola 8 a MIDI CH1 MIDI CH2 MIDI 2 MIDI MIDI a Bia 05 g MIDI CH14 DI fle mipi CH14 8 8 65 B MIDI CH15 B 15 88 s MIDI CH46 9 9 9 16 9 9 MIDI CH6 MIDI s
6. ice gmail com D2 07 144007 433V 433V D5 7 3 3 DC POWER SUPPLY 32 000MHz MIDI CHANNEL amp MODE CNYI73 S 000MHz ATXMEGA32D4 OPTIONAL EXTERNAL CLOCK a 7 BCS60C 2SA970 RIO erty BC550C 2502240 10uF tant 16V AUDIO OUTPUT Figure 1 4 BassBoy MIDI device schematic technical support andigo office gmail com BassBoy MikroElektronika
7. ocity 113 127 NOTE ON ACCENT SLIDE Duration of the note is until next note and is not defined by the GATE It turns the note on and triggers the envelope but it is applied only if the previous note doesn t have the SLIDE turned on If the previous note had SLIDE turned on then envelope wouldn t be triggered and only SLIDE effect would be executed Duration of the envelope is a constant 250mS Value of the accent is added to the level value of the note Accent is defined by the MIDI command CC 58 technical support andigo office gmail com BassBoy LIVE MODE is a mode in which the duration of the note is defined by the GATE VELOCITY defines the way notes are being played Velocity 0 100 NOTE ON Triggers the envelope Duration of the envelope is defined by the MIDI command 57 Velocity 101 127 NOTE ON ACCENT Triggers the envelope Duration of the envelope is constant 250mS Value of the accent is added to the level value of the note Accent is defined by the MIDI command 58 Function AUTO SLIDE is constantly turned on only in this mode and is triggered when notes overlap This mode is more suitable for playing over MIDI keyboard as well as controlling the unit via MIDI file while sequencer mode is more suitable for work with older sequencers that don t have note overlap function but can also be used for work with MIDI files easier input of sequences from other bass lines MIDI CONTROL CHANGE MESSAGES MidiCC
8. ximum value envelope is softened logarithmic and sounds like a little ducky effect Midi CC 59 Distort Gain default value 4 gain x2 Controls level of the sound coming out of the controlled amplifier Values from 0 to 127 Where values from 0 3 mean direct throughput without amplification and rest of the values are MIDI Value 4 127 2 amplification 2x to 63x It leads to hard cutting off of top of the signal depending on the value HARD CLIPPING DISTORTION and makes distortion of the sound Midi CC 60 Cut Off step default value 30 Controls fluency of the change to the cut off filter that is speed of step change to the MIDI command CC 54 Values 0 to 127 Midi CC 123 ALL NOTES OFF Used as PANIC command In case the note didn t get turned off for some reason sending this command note is turned off instantly Value doesn t affect execution of the command Electrical data Power supply 10V to 13V max DC Current consumption 100mA MIDI input separated by opto coupler Maximum output voltage approx 2 2VRMS 6 2V peak to peak output impedance 1MOhm approx 1 95VRMS 5 5V peak to peak output impedance 10kOhm measured with generated SINE wave directly towards DAC measured the 6 35mm jack Output impedance gt 10KOhm Notes in range from 32 70 2 to 523 25Hz that is MIDI note 24 to MIDI note 72 C1 C5 maximum deviation 1 5 cents MikroElektronika BassBoy technical support andigo off
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