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  <xs:element id="sond_LitigationSettlementPaymentTranchesDomain" abstract="true" name="LitigationSettlementPaymentTranchesDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheOneMember" abstract="true" name="LitigationSettlementPaymentTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheTwoMember" abstract="true" name="LitigationSettlementPaymentTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheThreeMember" abstract="true" name="LitigationSettlementPaymentTrancheThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementNumberOfPaymentTranches" abstract="false" name="LitigationSettlementNumberOfPaymentTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementTerm" abstract="false" name="LicenseAgreementTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementNumberOfExtensions" abstract="false" name="LicenseAgreementNumberOfExtensions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementRenewalTerm" abstract="false" name="LicenseAgreementRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementNumberOfTranches" abstract="false" name="LicenseAgreementNumberOfTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementNonCompetePeriod" abstract="false" name="LicenseAgreementNonCompetePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationPeriod" abstract="false" name="LicenseAgreementTerminationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationOwnershipChangePercentage" abstract="false" name="LicenseAgreementTerminationOwnershipChangePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationPropertyOwnershipChangePercentage" abstract="false" name="LicenseAgreementTerminationPropertyOwnershipChangePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PrivatePlacementTrancheOneMember" abstract="true" name="PrivatePlacementTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_SaleOfStockNumberOfTranches" abstract="false" name="SaleOfStockNumberOfTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_ShareholderSpecialMeetingPeriodMaximum" abstract="false" name="ShareholderSpecialMeetingPeriodMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePercentage" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePeriod" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePurchasePricePercentage" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePurchasePricePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_ShareholderVotingAgreementApprovalPercent" abstract="false" name="ShareholderVotingAgreementApprovalPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PreferredStockCumulativeDividendPeriodsAxis" abstract="true" name="PreferredStockCumulativeDividendPeriodsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="sond_PreferredStockCumulativeDividendPeriodsDomain" abstract="true" name="PreferredStockCumulativeDividendPeriodsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodOneMember" abstract="true" name="CumulativeDividendPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodTwoMember" abstract="true" name="CumulativeDividendPeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodThreeMember" abstract="true" name="CumulativeDividendPeriodThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_PreferredStockDividendRestrictionsCashFlow" abstract="false" name="PreferredStockDividendRestrictionsCashFlow" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_PreferredStockConvertibleUndiscountedConversionPrice" abstract="false" name="PreferredStockConvertibleUndiscountedConversionPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="sond_PreferredStockConvertibleConversionPriceDiscountPercent" abstract="false" name="PreferredStockConvertibleConversionPriceDiscountPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PreferredStockConvertibleThresholdTradingDays" abstract="false" name="PreferredStockConvertibleThresholdTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_PreferredStockChangeInTermsApprovalPercentage" abstract="false" name="PreferredStockChangeInTermsApprovalPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
