AMCS - the Advanced Music Construction System
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GENERAL					AMCS
TROUBLESHOOTING				the Advance Music Construction System


SUBJECT

	General: Troubleshooting


SUMMARY

	An attempt to pre-empt any potential issues with the system.


GENERAL

	Q) The system will not continue past a non-black blank display when
	powering on.

	A) Please ensure you have the manufacturer supplied system SD card
	inserted before you start. The SD card can then later be swapped for
	another once the system is functional.


	Q) I have the manufacturer supplied SD card in the system, but it is
	not continuing past the non-black blank display when powering on.

	A) It is likely the contacts on the SD card have become tarnished and
	are not making good contact. Use a cloth and electrical contact cleaner
	to clean the nine brass contacts located on the back of the SD card.


	Q) Some buttons in the section Function Panel do not do anything when
	pressed.

	A) The system is currently being developed and that particular feature
	is not available at the moment.


	Q) The framerate on the screen seems low.

	A) This is normal behaviour, the display update is processed at a low
	priority to make way for any higher priority audio processing.


	Q) Generated Waveforms seem to phase with other sound sources,
	why is that?

	A) The internal Waveforms are actually tuned to 51200Hz and then
	pitched to 44100Hz for memory alignment and optimisation purposes.
	Although the pitching attempts to be accurate there will be some
	error in handling finite calculations.


	Q) Some of my MIDI instruments do not respond to playing certain
	octaves.

	A) Unfortunately some instruments limit the range that can be used,
	this is especially noticeable in the MIDI functions and the only work
	around is to cap the Path Waveform within the range. It should be
	noted that testing revealed some instrument firmware will crash if
	you exceed the note range, and can only be recovered from by power
	cycling the instrument.


MEMORY

	Q) The system is showing the message memory depleted when the
	configuration reports there being memory available.

	A) This is normal behaviour as the system will attempt to keep enough
	memory available for storing a song to the storage. Low memory systems
	will be more likely to display this message when manipulating 
	instruments rapidly, try waiting a few seconds for the memory to be
	tidied up.


STORAGE

	Q) I have tried to use a storage card which is bigger than 4GB and the
	available space is not showing up correctly.

	A) The system only supports 4GB partitions, it is recommended you use a
	smaller card or try re-partitioning the card so that the primary
	partition is 4GB or less.


	Q) I have tried to use an MMC storage card, but the system does not
	show it as active.

	A) MMC cards are not supported.


MIDI

	Q) When I try to send some notes to an external sequencer or soft-synth
	it does not respond correctly.

	A) Unfortunately some software does not implement velocity based note
	handling, and by default the system will use this method to support
	older synthesisers. You can switch the method from velocity to function
	in the System Configuration section, but if the external software still
	fails to understand the MIDI transmission then we recommend you use
	something else which does not have MIDI support as an after thought.


	Q) There appears to be a slight delay when I try to record MIDI.

	A) It is recommended you disable the clock transmit on a MIDI instrument
	since this is unused and filtered out by the system. The clock
	transmission occurs 96 times a beat which can use up a lot of the MIDI
	communication bandwidth.


	Q) I have connected the MIDI instrument but it does not seem to respond
	to anything the system is transmitting.

	A) This is a common issue, most MIDI instruments default to not receive
	MIDI or at least the channel is not the same as the internal instrument.
	Please consult the manual for your MIDI instrument on how to set the
	MIDI receive.


USB

	Q) I have connected the latest USB gadget and it is not activating.

	A) As with all technology the next incarnation of gadgets seems to try
	and obsolete existing capable technologies for the sake of profit. Try
	to stick to recommended USB devices or at least devices which are
	compatible with USB 1.


	Q) Connected devices seem to be constantly reactivating.

	A) A device on the USB is not behaving itself, try a process of
	elimination by disconnecting each device until it stops happening.
	Some low cost devices require a huge amount of work to support since
	they generally misbehave during enumeration, we cannot prioritise
	development towards making these work.


USB-MIDI

	Q) When I boot the system, the USB-MIDI device sometimes does not
	activate.

	A) This is an issue related to USB timing, if the device does not
	respond within a certain time frame it is assumed as unavailable. The
	system does not continually scan the USB to see if anything new is
	connected since this will use up the bus bandwidth for more useful
	device communication. Either disconnect-reconnect the USB-MIDI device
	and wait a few seconds or reboot the system, this should solve the
	issue.


	Q) I have connected a USB-MIDI device and it is not activating.

	A) Only recommended devices should be used. From some research it has
	become apparent that some manufacturers have chosen to not conform
	exactly to the USB-MIDI specification, whilst we do attempt to support
	as many of the common devices as possible, it is unreasonable to
	support them all.


	Q) I have connected a USB-MIDI device and it is showing as active,
	but the MIDI instrument is not responding.

	A) Try connecting the MIDI receive connector to a powered MIDI
	instrument prior to connecting the USB connector on the USB-MIDI device.
	For some reason certain USB-MIDI devices can decide to fail
	initialisation if the MIDI receive is not attached.


RELATED

	General: Glossary

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								r24012017
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