Schlagwort-Archive: Lowpass Filter

The Daily Schaaf 6: Sonic adventures with nonlinear feedback paths


united-kingdom-flag-iconI can’t recommend running this stuff on your mobile phone. „The Daily Schaaf“ Audio Series audio demos are not compressed. All audio demos are uploaded as wav-files. This demo for example consumpts more than 80 MB. Listeners with download volume discounts on their mobile phone contract will hate these demos.

Today you can listen to a complex feedback patch on the Spectralis 2. I used one oscillator, the Fixed Filterbank as the feedback path and the 24 db Lowpass Filter plus filter FM and a couple of LFOs. The oscillator is fed into the lowpass filter, the lowpass filter is fed into the Fixed Filter Bank and the Fixed Filter Bank is fed back into the Lowpass Filter. You can hear, that the feedback is frequency dependent because of the filter bands. Each filterband has it’s one self resonation. Self resonating bands can become very loud. I did some volume automation after the recording to keep the higher frequencies in a lower level.
I am tweaking some parameters while it is running. That would not be necessary because the different asynchron LFOs already doing a good job changing the sound over time but who can resist tweaking it further while listening to it.

germany_texture

Ich kann nicht empfehlen, den „The Daily Schaaf“ Audio Demos auf dem Handy zu lauschen. Die Audio Dateien sind nicht komprimiert und das heutige Beispiel ist gleich mit über 80 MB am Start. Kunden eines Handy Download Volumentarifs werden diese Serie deswegen hassen. Es ist wesentlich sinnvoller, die Demos auf der Anlage zu Hause oder im Studio laufen zu lassen, wo die Dateigröße keine Rolle spielt.

Heute habe ich ein komplexes Feedback Patch programmiert. Dafür benutzte ich einen Oszillator, die Festfilterbank und das 24 db Tiefpass-Filter sowie ein paar LFOs. Das Oszillator Signal trifft zunächst auf das Tiefpassfilter. Von dort wird es in die Festfilterbank weitergeführt und von dort wieder zurück in den Tiefpassfilter Eingang. Auf diese Weise erzeugt man eine Feedback Loop, die aufgrund der Bandpässe nicht linear ist. Vom Tiefpass-Filter und von der Festfilterbank geht es zum Audio Ausgang.
Während der Aufnahme konnte ich es nicht lassen, hier und da auch Hand anzulegen. Wer bleibt schon ruhig vor seinem Synthesizer sitzen, wenn er so schön vor sich hin tönt. Aber im Grunde hätte ich das auch lassen können. Die vielen asynchron laufenden LFOs sorgen auch allein für immer neue Klangvariationen.
Da die Feedbacks zum Teil recht laut sind, habe ich nach der Aufnahme eine Volume Automation in meiner DAW erzeugt um die schlimmsten Ausbrecher zu zügeln.

 

 

Sound fart of the day 1: Formant Kreuzmodulation plus Filter


united-kingdom-flag-iconFor me, this is a typical Formant Synthesizer sound. Cross-Modulation with double filtering (24 db Lowpass plus parallel 12 dB Higpass). I like sounds like that a lot. I added some delay repeats from the soundcraft signature built in Lexicon FX to the recording.

germany_textureIch weiß nicht, ob dies für jedermann ein typischer Formant Synthesizer sound ist. Für mich ist einer. Kreuzmodulation und zwei Filter (24 db Lowpass + 12 dB Highpass). Man muss das nicht mögen. Aber mir gefällt so etwas. Als Effekt kam der eingebaute Effektprozessor von meinem Soundcraft Signature Pult zum Einsatz.

 

Spectralis LP filter repair I

The Spectralis 24 dB analog  lowpass filter opens actually up to 15KHz.  In rare cases a defective part prevents the control voltage from reaching the highest value. In this case, the filter opens up to a frequency of 4 KHz only. As a result the filter has a very mellow sound. You can check your filter by loading the file below. The download contains a zip file with a Spectralis pattern. The pattern must be copied into an empty song. Hook up the Spectralis to a computer with a USB cable and copy and paste the file into an empty song. If there is no empty song anymore  please copy one of the song folders from the Spectralis to your local harddisk (backup the song). Now you can delete the content of that folder on the Spectralis or the entire songfolder. After deleting the whole folder please create a new songfolder on the Spectralis flash memory and use the same name as the song from which you have previously made a computer backup. The name has the following format: „SongXX“ where XX stands for a songnumber between 01 and 32.

Download the file below, exctract the pattern and copy the pattern to the new song folder.

PATT01.SPT
Now unmount the Spectralis and remove the USB cable. Next please select the song and start the first pattern in pattern mode.

The pattern plays four notes over 4 octaves with a saw waveform. It starts with four octaves fed through the Multimode filter followed by the same notes fed into the lowpass filter.

If the second four notes are always mellow like the audio example below, the filter should be repaired:

But if the filters open almost with the same high overtones like in the audio file below, everything is fine:


The new frequency range of the filter can cause sound differences in your own songs. The frequency modulation caused by the envelope depth settings, sequencer line modulations, cutoff tweaks you maybe have recorded with the modulation wheel or with aftertouch or any other modulation of the filter will sound different after the modification!

If you want to make sure to get the same results like before this modifications, please just record your songs onto your DAW for later reference.

All the factory songs have been produced with a filter, that closes and opens in a normal way. The factory songs maybe will sound different but they will then sound like they have been produced by me. So – just enjoy the new versions of them 😉

I created a little instruction video for the repair. The defective part can be extracted by cutting the pins of a that part. That can be done with a box cutter. The pins can be cut much easier than you maybe expect. Please don’t move the cutter back and forth. If you do that you can maybe cut printed circuit board tracks, that are essential for the functionality of the filter. Simply place the cutter onto a pin as close as possible to the part itself and press the cutter down. Do that with all 3 pins. Afterwards you can take away the part. When you play the pattern again, it should sound like the second audio file.


Spectralis II Durchblick

Ringtone für’s neue Handy – a new ringtone for the new mobile phone

Ein kleines Weihnachtsgeschenk vom Spectralis Lowpass Filter für ihr Handy.
Zum Herunterladen bitte die rechte Maustaste über den Eintrag:
1. „Spectralis_Ringtone“ – Jörg Schaaf tippen und „Verknüpfte Datei laden unter..“ anwählen.

Besinnliche Weihnachten und meine besten Wünsche für das Jahr 2016!

A little christmas gift for your mobile phone.
To download the file please just right click on:
1. „Spectralis_Ringtone“ – Jörg Schaaf
and choose „save file as…“.

Merry Christmas and a Happy New Year!