# Question on MBSEQv4 LED matrix wiring

**URL:** <https://forum.midibox.org/t/question-on-mbseqv4-led-matrix-wiring/19833>\
**Category:** MIDIbox SEQ\
**Tags:** mbseqv4, led, matrix\
**Created:** [January 9, 2017, 4:24pm UTC](https://forum.midibox.org/t/question-on-mbseqv4-led-matrix-wiring/19833 "2017-01-09T16:24:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jjonas](https://forum.midibox.org/user_avatar/forum.midibox.org/jjonas/32/253_2.png) [@jjonas](https://forum.midibox.org/u/jjonas)\
**Post date:** [January 9, 2017, 4:24pm UTC](https://forum.midibox.org/t/question-on-mbseqv4-led-matrix-wiring/19833/1 "2017-01-09T16:24:02Z")

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Hi,

in the [pdf](http://ucapps.de/midibox_seq/mbseq_v4_dio_wilba_layout.pdf) on the Wilba frontpanel button/LED matrix, the dual-color GPx LEDs are said to be hardcoded into the firmware. But in the said [pdf](http://ucapps.de/midibox_seq/mbseq_v4_dio_wilba_layout.pdf) the information on how to wire them is confusing. In the _schematic_ the dual-color LEDs are wired to pins D4-D7, but in the _chart_ next to the schematic they are wired to pins D3-D0. The question is: which version in the linked [pdf](http://ucapps.de/midibox_seq/mbseq_v4_dio_wilba_layout.pdf) – schematic or chart – is the one that I should use if I want to make a DIY frontpanel with DIO matrix?

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**Author:** ![T.K](https://forum.midibox.org/user_avatar/forum.midibox.org/t.k/32/7_2.png) [@T.K](https://forum.midibox.org/u/T.K)\
**Post date:** [January 9, 2017, 9:47pm UTC](https://forum.midibox.org/t/question-on-mbseqv4-led-matrix-wiring/19833/2 "2017-01-09T21:47:49Z")

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Hi,

thanks for pointing this out!

The table was correct, the schematic wrong. It’s corrected now:&nbsp;[http://www.ucapps.de/midibox\_seq/mbseq\_v4\_dio\_wilba\_layout.pdf](http://www.ucapps.de/midibox_seq/mbseq_v4_dio_wilba_layout.pdf)

Best Regards, Thorsten.