KETRON sd4 - USB Interface and Sound Generation; USB Connectivity for MIDI and Power; Sound Generation Overview

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 o “ACC”: Accordion
 o “ORG”: Organ
 o “MID”: 2xMidifile
 Pressthekeystochangetheinstrument’soperatingmode.

TheUSBconnectionenablesMIDIconnectionandcommunicationbetweentheinstrument
andapersonalcomputer.Inparticular,whenisconnectedtoaMasterdevice,itis
abletousepowerdirectlyfromtheconnection.Theconnectionaloneistherefore
sufficienttoswitchtheinstrumentonandsetitintheselectedoperatingmode.Thefirsttime
thatisconnectedtoacomputer’sport,itisdetectedandinstalledautomaticallyby
thesystem.Thedeviceisrecognisedbythepersonalcomputerasawiththree
differentvirtualMIDIports.Thereactionofsuchportsisbasicallyidenticaltotherealports
atthebackoftheinstrument.TheMIDIdataareexchangedbetweentheinstrumentand
thePCviaUSBtobeabletoexploittheinstrumentalsoasaMIDIinterface.Supposingindeed
youhaveaMasterkeyboardwiththeclassicMidiOutconnector(five-pole)andyouwantto
connectittoaComputerthatdoesnothavethededicatedMidiInconnector.Toresolvethe
problem,simplyinstalltheinstrumentbetweentheMasterkeyboardandtheComputer
inthefollowingmanner:
WhenyouusetheUSBconnection,rememberthat,consideringthatalltheMIDIportsare
alwaysconnected,theMIDIdataoutputfromthepersonalcomputercouldbesentbacktothe
inputsofthesameandproduceannoyingsoundloops.Toavoidtheseproblems,disablethe
MidiThrufunctionofthesequencerusedorsettheMidioutputsofSD4in“OFF”.Forfurther
details,consulttheMidiMenusectionofthismanual.

Thesoundgenerationoftheinstrumentconsistsofthefollowingsections:
 3GMbanksof128soundseach
 32Drumset
 82Grooves(Drum2)
Thereisanotherspecialbankof128soundsforatotalof512differentsounds.
Therearealso128,eachofwhichmaycompriseamaximumofthreeGMsounds.A
Presetisinotherwords,acombinationofsoundsthatcanbeassignedtoeachofthethree
sectionsofthe
instrument. For example: 
49 (Piano&Strings) consists of the
following3overlappedsounds.