Shruthi XT synthesiser Metal case

OVERVIEW

Shruthi XT synthesiser is an advanced DIY synthesizer available in multiple filter variants, with a metal case and choice of OLED or LCD display.

Specifications:

• Filter variants: SMR4mkII multimode LP BP HP, 4Pole Mission, Polivoks
• Metal case in black or white
• OLED or LCD display
• Professional build quality
• Perfect for musicians and DIY enthusiasts

Overview

The Shruthi comes either in the classic version with only 4 knobs below the screen; or the XT version which provides hands-on controls on all synthesis parameters. The panel of the XT version is divided into 3 sections: oscillators/mixer/filter; main control; and modulations (LFOs/envelopes). The main control section is the same on the XT and on the classic versions.

The main control section consist of the following elements:

• The LCD or OLED display shows, most of the time, the name and value of the 4 parameters that can be directly edited with the potentiometers under the screen. When a parameter is modified, the display temporarily shows the full name of the parameter and its value. In some other circumstances, the display might show a confirmation messages, the content of a sequence, etc.
• The clickable encoder can be used to navigate between parameters/pages, or to step through the values of a parameter.
• The four potentiometers below the display modify the synthesis parameters currently displayed on the active page.
• The 8 LEDs provide complementary information about the active page.
• The 6 switches facilitate navigation between pages. The switches S1 to S4 are used to cycle between groups of related pages; S5 is used to switch between the synthesis pages and the sequencer/system pages; and S6 is used to bring the load/save page to load and recall presets.

The following connectors are available on the rear panel:

• 1: 2.1mm DC power jack. The Shruthi can be powered with a 7.5V-9V unregulated supply, or with a 9V battery adapter. Make sure that the connector has a center pin (or tip) positive / outer collar (or sleeve) negative pin polarity. Most universal power supplies allows the polarity to be selected -- the polarity being often represented by a diagram like this: - (o +, or by the indication tip: +. The power supply has a reverse polarity protection.
• 2: MIDI in. This input should be connected to the MIDI out port of a sound card, master keyboard, sequencer...
• 3: MIDI out. This output can be used as a MIDI thru, but also to transmit the notes generated by the Shruthi's internal sequencer, backup data, or for polychaining units.
• 4: Line-level, mono audio output.
• 5: Line-level, mono audio input. Note that the external audio signal flows through the VCF and the VCA - you won't hear anything until a note or sequence is played by the Shruthi to "open" the VCA.

In addition to the extra knobs for editing synthesis parameters, the XT additionally features:

• An on/off switch on the back panel.
• A global volume knob.
• A Jam button which holds a note and starts the sequencer/arpeggiator.