In the traced MIDI messages in the bug-report, the top line is the most recent, and the bottom line is the oldest. It came from the Java console (of IcedTea).
-- You received this bug notification because you are a member of OpenJDK, which is subscribed to openjdk-8 in Ubuntu. https://bugs.launchpad.net/bugs/1755640 Title: Pitch-Bend Control Wrong On Java MIDI Interface Status in openjdk-8 package in Ubuntu: New Bug description: When using a Java MIDI interface to connect a MIDI keyboard to either the Java Sound Synthesizer, or to an external MIDI synthesizer (via a hardware MIDI interface), the pitch-bend MIDI message is two half- steps (one note) low (out-of-tune). It appears that the data1 (least-significant byte), and data2 (most- significant byte) values are interpreted as a signed 14-bit number (whose mid-point is 0), rather than an unsigned 14-bit number whose mid-point is X'00', X'40' = X'0200', as specified in the MIDI spec. This results in all further notes played being a whole-step too low, and the pitch-bend values within the range of the MIDI keyboard not being a smooth progression from low to high. Here is information from the MIDI trace: Input IDLE. Input ACTIVE. Forwarded MIDI = E0, 00, 40 (this message generated by the code to compensate for being out-of-tune) Received MIDI = E0, 00, 00 Received MIDI-message: E0 Received MIDI = E0, 00, 01 (should have been E0, 00, 41) Input ACTIVE. Received MIDI-message: E0 Received MIDI = E0, 00, 02 (should have been E0, 00, 42), etc. Received MIDI-message: E0 Received MIDI = E0, 00, 03 Received MIDI-message: E0 Received MIDI = E0, 00, 05 Input IDLE. Input ACTIVE. Forwarded MIDI = E0, 00, 40 Received MIDI = E0, 00, 00 Received MIDI-message: E0 Received MIDI = E0, 00, 01 Input ACTIVE. Received MIDI-message: E0 Received MIDI = E0, 00, 02 Received MIDI-message: E0 Received MIDI = E0, 00, 03 Received MIDI-message: E0 Received MIDI = E0, 00, 05 Input ACTIVE. Received MIDI-message: E0 Received MIDI = E0, 00, 04 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 03 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 02 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 01 Received MIDI-message: E0 Input IDLE. Input ACTIVE. Received MIDI = 90, 3C, 00 Received MIDI-message: 90 Input ACTIVE. Received MIDI = 90, 3C, 53 Received MIDI-message: 90 Input IDLE. Input ACTIVE. Input ACTIVE. Received MIDI-message: E0 Received MIDI = E0, 00, 04 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 03 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 02 Received MIDI-message: E0 Input ACTIVE. Received MIDI = E0, 00, 01 Received MIDI-message: E0 Input IDLE. Input ACTIVE. Received MIDI = 90, 3C, 00 Received MIDI-message: 90 Input ACTIVE. Received MIDI = 90, 3C, 53 Received MIDI-message: 90 Input IDLE. Input ACTIVE. This is different from how it works on Oracle Java 8, where the value for 'no pitch-bend' shows up as E0, 00, 40. It is possible to send the proper pitch-bend values from a Java- implemented MIDI transmitter, but received pitch-bend values (coming in on an input MIDI interface) get transformed to an improper value. This problem has probably been in-existence from the first release of open Java. I tested on an old system having Open Java 7, and the problem was there too. Until I created 'wrapper code' for the Java Sound (Gervill) Synthesizer, I had no way to test this functionality. My expectation is that Open Java will handle pitch-bend messages the same way as Oracle Java does. I am using Lubuntu 17.10, but the problem also occurs on Lubuntu 16.04.4. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: openjdk-8-jre 8u151-b12-0ubuntu0.17.10.2 ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13 Uname: Linux 4.13.0-36-generic i686 ApportVersion: 2.20.7-0ubuntu3.7 Architecture: i386 CurrentDesktop: LXDE Date: Tue Mar 13 19:00:12 2018 InstallationDate: Installed on 2016-05-01 (681 days ago) InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1) SourcePackage: openjdk-8 UpgradeStatus: Upgraded to artful on 2017-10-23 (141 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openjdk-8/+bug/1755640/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~openjdk Post to : openjdk@lists.launchpad.net Unsubscribe : https://launchpad.net/~openjdk More help : https://help.launchpad.net/ListHelp