Tag: Alesis

Signal Processing 102: An Introduction to Time and Modulation Based Effects

Time Based Effects

Also refered to as parallel effects due to the way in wich the processed signal is mixed together with the original signal, time based effects extend the duration of audio signals relative to the original signals. The two main time based effects are reverberation, and delay.


Alesis Midiverb4
Reverb is simply a simulation of a natural reverberation of a room. The ambient sound waves that bounce around a room based on the rooms dimensions are reproduces by digital signal processing (DSP) either modeled from a convolution algorithm or a sampled impulse response. Prior to DSP recording studios had to use an actual room to record reverbs by reproducing an audio signal such as a vocal with a loudspeaker and recording it again with a microphone in the desired environment. These resulting track was then mixed back in the original signal. Reverbs are categorized by the way in which they are made. Smaller sounding reverbs are considered room or chamber reverbs while long echoing reverbs are refereed to as halls. Spring and plate reverbs refer to the manner in which the reverb is artificially created.


Alesis Midiverb4
Delays are echo effects that are mixed back in with the original signal to give space and dimension. Delay parameters include: time, (the actually delay time from the orignal signal to the affected signal), feedback, (the amount of affected signal that is reintroduced into the delay circuit). The individually instances of delay resulting from feedback are refered to as taps.

Modulation Effects

Modulation effects are composed of audio signals that are split into two or more signals, then mixed back together creating an effect based on the relationship between the two or more identical audio signals. The effects are created by phase anomalies resulting from the varying the time and amplitude relationships between the multiple signals. they can be across the entire frequency spectrum or select bands of frequencies. Modulation effects include: flanger, chorus, and phasers. Modulation effects are some of the more spectacular and dramatic processing effects that can be done to an audio signal but they can be reproduced with very simple circuitry and even simpler DSP (digital signal processing). Flanger effects are a very common and popular effect for guitars and basses. The term flanger comes from the original way in which the effect was created. By syncing together two reel to reel tape machines and recording the same signal to both, a flanger effect can be produces by playing back the tape machines in sync and dragging your finger with varying pressure across the flange of one of the tape machines. The resulting varying speed producing a phase anomaly that sounds like a jet fly by.


Imaging is an element of audio signals that are in stereo and is simply where in the stereo image the audio signal is placed and how it behaves. For example a tremolo is a popular guitar and organ effect that raises and lowers the amplitude of an audio signal to a set rate and depth. If you were to incorporate an imaging effect such as autopan, the signal will seem to dance back and forth, left to right in the stereo image while seeming to appear and disappear.


Alesis DM10 Pro Kit: Feel the Real!

Alesis 10

The Drum PadsAlesis 10

The Alesis DM10 Pro Kit is the first electronic drum set to combine the natural feel of real drum heads and real alloy cymbals with Alesis’ innovative Real Head drum pads and  Surge cymbal pads.  The real head drum pads have genuine tension adjustable Mylar heads that can be adjusted with a standard drum key. The DM10 Pro and the DM10 Studio kits include the new massive 10” dual zone snare and floor tom pads.

The Cymbal Pads

Alesis Surge Cymbal
These electronic cymbals feel like acoustic cymbals because they are real alloy cymbals made like real acoustic cymbals. Each Surge cymbal multi-zone featuring a choke ability that brings a dynamic realism to the overall sound of the kit.

The Module

DM10 Drum Module

The brains of the operation for both the DM10 Pro Kit and the DM10 Studio Kit is the DM10 drum module. This powerful drum module features 12 trigger inputs and is equipped with a mixer so you can level you kit out on the fly or mix in an iPod or CD on an aux track to practice with. The DM10 drum module supports 64 voices of polyphony and is loaded with 1,047 uncompressed samples, 100 preset drum kits, and 75 preset sequencer patters as well as 25 user patterns which all can be overwritten. The DM10 drum module is the first electronic drum set module that offers unlimited expandability with the option to load addition sample packs via USB from top of the line sample libraries such as Ocean Way Drums, fxpansion, Inaudio, Sonic Reality, and Blue Jay Studios. In addition to the USB capabilities the DM10 module is equipped with a MIDI I/O interface so the module can be controlled with an external sequencer or be used as a MIDI percussion interface for other samplers and programs such as EZ Drummer and BFD.

The DM10 Pro Kit is perfect for percussionists who like get in many hours of practice but may lack the space to have a large acoustic drum in a bedroom.   For your neighbors sake the DM10 Pro Kit can be monitored simply through headphones, a particularly handy feature for someone just starting out. Recording with the DM10 is easy and fun with the mixed line level outputs or for perfect drums every time the MIDI output can be used to record drums that can be edited to the last detail.


Alesis SR18 Drum Machine

Alesis SR18 Drum Machine

By David D. – Product Specialist

Alesis has been a very popular name in the drum machine market since their introduction of the SR16 in the early 90’s. The SR18 is the next generation of drum machine produced by Alesis and is equipped with electronic drums, cutting-edge drumsets, one shot hits, and modern percussion sounds. Being that is the next generation model from Alesis, the traditional square look that most equipment shares has been replaced with rounded side edges that give it that contemporary look.

The top panel is outfitted with a large blue backlit screen that provides you with an easy to read view at your settings including tempo, patch and other important information. During any editing process, the screen will also give you visual feedback to make the process even easier. The large top panel scroll wheel allows you to instantly perform quick edits of parameters and browse through parameters. The scroll wheel is also supplied with a convenient finger indent that provides it with simple and comfortable operation. Record and Tempo indicators are also equipped on the top part of the SR18.

The control panel is located below the screen and scroll wheel and contains all the necessary commands to make the functionality of the Alesis SR-18 perform. From setting up to record, setting tempo, choosing effects, playing your creations, and much more, this is where most of the work will take place. The mute button on the control panel allows you to mute the drums, bass, percussion, and individual pads. Other cool commands include save/copy, pattern/song, erase, drum set, and many more.

The bottom panel consists of 12 large pressure sensitive pads. These pads work as triggers for percussion and drum sounds; you can use these sounds for recording your own rhythm patterns and creations. Each percussion pad is labeled with easy to read white font and numbered 1-12, making it even easier to create some awesome sounds.

The back panel of the Alesis SR18 Drum Machine is supplied with all the necessary connections you will ever need. There are 4 outputs which consist of AUX L/R, Main Right, Main Left, and Phones. There is also one MIDI output, one MIDI input, two footswitches, power connection for 12 volt, on/off switch, and a fully adjustable volume knob. One more cool feature is the instrument input, just plug your instrument in and its signal is added to the output.

This drum machine has over 500 drum and percussion sounds along with 50 bass sounds. This should be plenty to have your musical imagination flowing for a long time.


Alesis M1 Active 520 & 620 Studio Speakers

Alesis M1 ACTIVE 520 Studio Monitor Speakers

By David D. – Product Specialist

Alesis is well known in the Pro Audio industry for making professional studio quality products and the M1 Active 520 & 620 Studio Speakers will help keep that reputation. Both theses speakers are equipped with a durable 1” thick front baffle, this helps eliminate speaker vibration and increase sound quality. A matte black textured finish provides these speakers with an attractive appearance, while the cabinet’s rounded front edges improve the look and reduce diffraction. Adding to the stunning looks are the computer style power switches with blue illuminated LED indicators located on the top of the cabinet. The M1 520 & 620 speakers also share high precision drivers which offer minimal distortion while providing a smooth frequency response. The integrated rear port provides deep bass and increases the SPL. Both these studio speakers also offer acoustical waveguide for enhanced imaging, EQ switches to control high, mid and low frequencies, magnetically shielded encasement for close placement to video monitors, low frequency density switch for space adjustment of the monitors, and XLR and 1/4″ TRS input connectors with volume control.

M1 Active 520

The Alesis M1 Active 520 Studio Speakers are constructed with a 75 watt bi-ampable design. The 5” low frequency woofer is 50 watts and provides a clean and crisp bass and midrange. For the highs, the 520 is equipped with a ¾” silk dome tweeter, the tweeter has 25 watts of power and produces very clean and detailed highs. Weighing in at 6.5 pounds each, the speaker is very lightweight and compact making placement easy and convenient. The M1 520 features a gain control knob, acoustic space switch, Hi boost switch, Mid boost switch, low 3dB roll off switch, and a AC voltage selector switch. This speaker is a great choice for smaller studios where desktop monitors are required.

M1 Active 620

Alesis M1 Active 620 Speaker has a 95 watt amplifier built-in and features a bi-ampable design as well. This speaker has a 6-1/2” polypropylene woofer with rubber surrounds that puts out 65 watts of power for high outputs of pounding bass. To match that bass output with highs, Alesis has integrated a 1” silk dome tweeter with 30 watts of power for very accurate and powerful highs. The 620 weighs 10.5 pounds each and work great in medium sized studios. This speaker features a top-mounted power switch/clip indicator, low frequency density switch, high frequency EQ control, mid frequency EQ control, and a low frequency EQ control to adjust the sound setting at your preference.