Hello !

I am not very experienced in PD neither am I in Android development, I'm just a coder who's OK in the Java programming language. I intend to build an Android app using libpd for one of it's features - a screen with a piano-roll type of sequencer that plays the notes using a simple sine wave.

I don't come to ask for solutions but for some light ahead of my path - what kind of development roadmap do I have ahead? How should I implement my idea?

The idea is simple:

1 - a sequencer like in this picture: http://tangram.dnsalias.net/lmms/0.3.1/tutorial-1stsong/variation-2.png

2 - the sequencer plays a single Sine wave

3 - to have the ability to change the synth's ADSR parameters at any time

4 - if I click the piano keys on the left I hear the note's sound

5 - to be able to export the composition to MIDI

As you can see, the synth requirement is extremely basic. Creating a simple sine wave synth in PD with editable ADSR is something I already know how to do!

But to make it work with such sequencer, I have no idea. What will I need from PD and how should I integrate it with a UI ? Can the sequencer logic be made in PD?

Should I:

• create a pd patch that's a simple Sinusoid synth with adjustable ADSR parameters

• create another PD patch that's a sequencer, that would work with the previous patch to emit sounds?

• make a patch that's the combination of both above ?

• should I use PD just for the sound synthesis and use just java code for the sequencing ? Would this be even reliable ?

• does MIDI need to have any role in this? I only want to export MIDI files with the composition, nothing more.

Thanks for reading this far! Again, I'm just asking for advice on the kind of development roadmap I have ahead, so any tiny tip that guides me will be greatly appreciated!

Thank you

ps: My apologies if I'm not posting this in the correct section, after reading the sections' Abouts I'm still unsure where to post this

Hi antoniobrandao,

It seems like you've already got a pretty good idea about how proceed with your sequencer. The only thing I can suggest is just go ahead and do it!

The main issue I see is deciding where to implement your sequencer, and how to keep it in sync with the GUI. A fully featured sequencer is not the easiest thing to achieve, especially if you're new to Pure Data. It probably comes down to which language you are more comfortable in.

Maybe just have your sound source in Pure Data, a polyphonic synth with adjustable ADSR. Then send it messages to play it from your sequencer in Java.

Hope that helps,
Joe