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Author Topic: SMS issue?  (Read 6707 times)

efs

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SMS issue?
« on: January 13, 2014, 10:48:34 pm »
Hello, Delek and friends.

Recently I've been coming across something weird while creating SMS music in DefleMask. I'm not quite sure if it's a bug, since most anomalies like this are just a product of the sound chip's behavior itself, but either way...

When creating an SMS song, I can't seem to use channels 3 and 4 at the same time without odd quirks happening. I use Channel 4 for percussion, of course, but whenever a note in Channel 4 is played at the same time as a note in Channel 3 (or something to that effect), Channel 3's note always bugs out and ends up playing a very high, off-tune note.

The behavior of this quirk is certainly indicative of a behavior in the original hardware, but I'm not so sure, since I've heard plenty of music made with the SMS sound chip that takes advantage of all three melodic channels plus the noise (percussion) channel, so I'm at a loss.

If anyone can clear this up, that'd be cool.

EDIT: I've figured out that the notes in Channel 4 effectively change Channel 3's notes to whatever they are. This is looking most definitely like a limitation in the original hardware, though I still wonder how most official SMS music got away with channels 3 and 4 playing concurrently.

Offline Delek

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SMS issue?
« Reply #1 on: January 14, 2014, 01:16:49 am »
Channel 4 has two modes, a independent one with only 4 notes, and a channel 3 dependent with the whole register. Check the manual in order to check for the needed effects.

efs

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SMS issue?
« Reply #2 on: January 18, 2014, 06:49:46 am »
Thanks for the explanation. I did check out those alternate modes when I started out my SMS experiments. I was unaware that the default one was Channel 3-dependent when I started out, but that does make a lot more sense now.

Offline marcb0t

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SMS issue?
« Reply #3 on: January 25, 2014, 03:46:08 am »
Yep! That's correct.

The following is based on my experimentation:

You can blank out the PSG Volume Macro for the channel 3 tones, and use a separate instrument for the Noise channel to hear only the noise. Now if you set your effects to 2001, 2003, 2005, 2007, or 2009, you will gain access to the classic Low, Medium, and High noise. These can be used along side 3 independant PSG tones, and will not effect one another. Set the effects to 2002, 2004, etc., and you can get Low, Medium, and High PWM tones from the Noise channel. They will all be an "A" note, and cannot be changed from that. You can have all 4 channels play at once in this mode as well. With both modes, use the notes C, C#, and D in any Octave to get the Low, Medium, and High tones, respectively.

Set the Noise effect to 2010, and you will get multi tonal PWM tones from the Noise. Leave channel 3 blank, and use the Noise Channel to make musical notes. 2011 will get multi tonal Noise sounds. Check out some of the excellent demos to find out more about how to mix and match these different modes.

Hope this is helpful,
marcb0t

Raingerred

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SMS issue?
« Reply #4 on: May 09, 2014, 05:13:33 am »
Channel 4 has two modes, a independent one with only 4 notes, and a channel 3 dependent with the whole register. Check the manual in order to check for the needed effects.
I had sam problem but after this explanation i am fully confident that i will solve it. thanks